The Short Answer
The flight department company trap is when you place your aircraft in a single-purpose entity (often an LLC) whose only business is owning and flying it for your other companies. Because that entity does nothing except provide air transportation, and your affiliates pay it (or fund it) for the flights, the FAA can treat the flying as carriage for compensation or hire — which Part 91 does not permit and which generally requires a Part 135 certificate the entity does not hold.
The controlling test comes from the definition of commercial operator in 14 CFR §1.1: where it is doubtful an operation is for compensation or hire, the question is whether the carriage by air is “merely incidental to the person’s other business or is, in itself, a major enterprise for profit.” A company whose only business is the flying has no other business for the flying to be incidental to — so it fails the test.
Crucially, this is not a common-carriage or “holding out” problem — flying only your own affiliates is usually not holding out. It is a compensation-or-hire problem, and even private carriage for compensation generally must run under Part 135. The fix is a structuring decision (keep the flying incidental to a real operating business, use a properly papered dry lease, or get certificated) that belongs to an aviation attorney. FileFlo keeps the operating agreement, operational-control evidence, lease, and insurance records organized and provable — it does not structure the deal or give legal advice.
Why careful operators fall in anyway
The trap is insidious precisely because the people who hit it are doing something sensible — isolating an expensive asset in its own entity for liability and accounting reasons. They correctly reason that they are not a charter company and not holding out to the public, and then wrongly conclude that Part 91 must therefore apply. The compensation-or-hire line sits underneath the common-carriage line, and you can be nowhere near common carriage and still on the wrong side of it. NBAA named this the “flight department company trap” for exactly that reason.
What a “Flight Department Company” Actually Is
The term is NBAA’s. A flight department company is a single-purpose entity — most often a newly formed LLC — created to hold a business aircraft. The logic that produces it is almost always the same and almost always reasonable: a company buys (or already owns) an aircraft, wants to keep that multi-million-dollar asset and its liability isolated from the operating business, and so drops the aircraft into a clean, standalone entity. That entity owns the plane, often employs or contracts the crew, pays the hangar and the insurance, and flies the parent company’s executives where they need to go. On a whiteboard it looks tidy. On the regulations it can be a problem.
The defining feature — and the source of the danger — is that the entity does nothing else. Its entire reason to exist is owning and operating the aircraft. It has no widgets to sell, no services to render, no business that the flying supports as a sideline. The flying is not incidental to its business; the flying is its business. The moment money moves from the affiliated companies to that entity to pay for, or fund, the transportation, you have an entity whose major enterprise is air transportation for value. That is the exact profile the FAA scrutinizes.
What it looks like (the appeal)
A standalone LLC owns the jet, carries the insurance, holds the crew, and flies the parent and its principals. Liability is walled off, the asset is cleanly held, and the books are simple. For everything EXCEPT the FAA, this is a perfectly ordinary structure.
Why the FAA reads it differently
Because the entity has no other business, the flights cannot be incidental to anything. When affiliates pay or capitalize it for those flights, the FAA can see compensation for transportation by a company whose major enterprise is exactly that — the hallmark of a commercial operation that belongs under Part 135, not Part 91.
Ownership is fine — operation is the issue
Nothing here says an LLC cannot own your aircraft. Single-member LLCs hold aircraft title every day, and there are real registration and liability reasons to use one. The trap is specifically about an entity that both owns and operates the aircraft as its sole business. A pure holding entity that owns and registers the plane, while operational control and the real business sit elsewhere, is a different animal — see the FAQ on whether an LLC can own and operate your airplane.
Related aviation compliance reading
Why It Is Illegal Under Part 91: The Compensation-or-Hire Test
Part 91 governs general operating rules — the rules under which private and corporate flights are flown. The bright line that Part 91 cannot cross is compensation or hire: you generally cannot carry persons or property for compensation under Part 91. The instant an operation is compensated carriage that is not incidental to a separate business, it is a commercial operation, and commercial carriage of this kind generally must be conducted under Part 135 (or, for larger operations, Part 121).
The test, in the FAA’s own words
The definition of commercial operator in 14 CFR §1.1 supplies the test the whole trap turns on:
“Where it is doubtful that an operation is for ‘compensation or hire’, the test applied is whether the carriage by air is merely incidental to the person’s other business or is, in itself, a major enterprise for profit.”
Read that against a single-purpose flight department company. It has no “other business.” The carriage by air cannot be incidental to a business that does not exist. So the carriage is, by elimination, the entity’s enterprise — and once it is funded by the people being flown, the FAA can treat it as the kind of operation that requires a certificate.
The applicability rule that pulls such an operation into the air-carrier regime is 14 CFR §119.1, which applies Part 119 (and through it Part 135 / 121) to persons operating as an air carrier or commercial operator in air commerce. The flip side is the same regulation’s exclusions in §119.1(e) — student instruction, certain ferry and training flights, specified aerial work — none of which a flight department company’s executive transportation fits. There is no Part 91 carve-out that rescues compensated, non-incidental carriage by a sole-purpose entity.
“Compensation” is broader than a ticket price
The compensation that triggers the rule does not require profit and is not limited to a cash fare. The FAA has long read it expansively to include indirect value — cost reimbursement, the assumption of expenses, and capital contributions made specifically to fund the flights. In the flight department company, the very payments and contributions that capitalize the entity to do its job can be the compensation that makes the job a commercial one. The precise boundaries of what counts are drawn through FAA legal interpretations and guidance, not one tidy CFR sentence — which is why counsel, not a checklist, settles it.
This is the same compensation-or-hire boundary that separates corporate Part 91 flying from charter generally. If you want that broader frame, read Part 91 vs Part 135: compensation or hire alongside this piece — the flight department company trap is one specific, structural way an operator lands on the wrong side of that exact line.
Can you prove who actually controls — and pays for — your flights?
Whatever structure your attorney lands on, the proof lives in documents: the operating agreement, the operational-control evidence, any lease, and the insurance that matches the real use. FileFlo classifies and version-tracks that record so it is organized and producible on demand. Check where you stand with the free FAA Readiness Score, or start organizing the record today.
It Is Not a “Holding Out” Problem — and That Is Why It Catches People
Many operators assume that the only way private flying becomes a Part 135 matter is by holding out to the public — advertising charter, listing the aircraft, taking all comers. So they reason: “We only ever fly our own companies, we never offer the aircraft to outsiders, therefore we are not a common carrier, therefore Part 91 is fine.” The first two clauses are usually correct. The conclusion does not follow.
The FAA’s framework, set out in Advisory Circular 120-12 (current revision AC 120-12A, Private Carriage Versus Common Carriage of Persons or Property), distinguishes two kinds of carriage for hire:
Common carriage
Carriage for hire that does involve holding out — offering transportation to the public or a segment of it. AC 120-12A frames it as four elements: (1) a holding out of a willingness to (2) transport persons or property (3) from place to place (4) for compensation. This is the world of charter brokers and grey charter.
Private carriage for hire
Carriage for hire that does not involve holding out — flying only a closed set of customers, such as your own affiliated companies. There is no public offering at all. A flight department company typically sits squarely here.
The point that closes the trap
Here is what the “we don’t hold out” reasoning misses: private carriage for hire still generally requires a Part 135 certificate. Avoiding holding out keeps you out of common carriage — it does not keep you out of commercial operation. So a flight department company can be completely free of any common-carriage concern and still be flying illegally under Part 91, because the operation is compensated carriage that is not incidental to a separate business. The holding-out question and the compensation-or-hire question are two different gates, and the trap lives entirely in the second one.
Because holding out is a doctrine framed by guidance rather than a single CFR section, be wary of any source that points you to a paragraph “defining holding out.” For the full treatment of that concept, see what is “holding out” in aviation, and for the doctrine’s enforcement edge, the FAA crackdown on grey charter. The unifying concept beneath all of it — who is actually responsible for the flight — is operational control.
The Consequences Reach Past the FAA
If the trap were only an FAA paperwork issue, operators might gamble on it. The reason aviation attorneys treat it so seriously is that the same mischaracterization radiates into insurance, financing, and tax — and the worst of those bills usually arrives at the worst possible moment. None of the following are FileFlo determinations; they are the exposures practitioners warn about, and each is a reason to settle the structure with counsel before flying.
FAA enforcement
Conducting a commercial operation without the required certificate is a regulatory violation. The FAA can pursue civil penalties and certificate or airman action. Beyond fines, an enforcement finding becomes a fact that the other exposures below can attach to.
Voided or disputed insurance
Aviation policies are frequently underwritten on the premise that the operation is a lawful Part 91 flight. If the operation was actually an uncertificated commercial one, an insurer may dispute or deny coverage — which, after an accident, is the catastrophe the whole entity was supposed to prevent. This is the consequence that frightens advisors most.
Breached finance & lease covenants
Aircraft loans and leases routinely require that the aircraft be operated lawfully and in compliance with the FARs. An illegal operating structure can breach those covenants, with consequences ranging from default provisions to accelerated obligations.
Unraveled tax positions
Tax planning is often layered on top of the operating structure. If the operating assumptions underneath were wrong — the entity was not a lawful Part 91 operator — the tax posture built on them can be challenged. This is a CPA-and-counsel question, not a FileFlo one.
The compounding risk
These exposures are not independent — they compound. An accident triggers an insurance review; the review surfaces the operating structure; the finding that it was an uncertificated commercial operation feeds the FAA action, the coverage denial, the loan default, and the tax challenge at once. That cascade, far more than a routine ramp check, is why “we’ll fix the structure later” is a dangerous plan.
How Attorneys Structure Around the Trap
There is no universal fix, and anyone who sells you one without examining your facts should worry you. NBAA and aviation counsel treat avoiding the trap as a structuring exercise with several recognized paths, each with its own FAA, tax, insurance, and liability trade-offs. The three most commonly discussed are below — presented as orientation to the conversation you should have with an aviation attorney, not as advice to adopt any of them on your own.
Keep the flying incidental to a real operating business
Rather than isolating the aircraft in an entity that does nothing else, the aircraft is owned or operationally controlled by a company that has a genuine, separate business — so the flying is incidental to that business and stays within Part 91. The diligence is in making sure the operating company truly exercises operational control and that the flights genuinely support its real operations.
A properly papered dry lease
The asset can sit in a holding entity that dry-leases the aircraft (aircraft only, no crew) to the operating company, which supplies its own crew and exercises operational control. Done correctly, operational control and the real business purpose live with the lessee. Done sloppily — the holding entity keeps supplying the crew or directing flights — it collapses back into the same trap. See our dry-lease and operational-control explainers.
Get certificated (or place it with a Part 135 operator)
If the use is genuinely commercial, the honest answer may be to operate under a Part 135 certificate — your own, or by placing the aircraft on an existing certificated operator’s certificate. The operation then becomes legal on its own commercial terms rather than straining to fit Part 91. This is the path the leaseback and management-company routes often lead to.
Why this has to be counsel, not a template
Each path turns on facts a blog post cannot see — who really controls the flights, how the entities are funded, what the insurance assumes, what the loan covenants require, and how the tax plan is built. A structure that solves the FAA problem can create a tax or insurance one, and vice versa. The judgment that reconciles all of it belongs to your aviation attorney working with your CPA and your insurer. FileFlo does not make that call and does not draft these structures.
The lease and certificate paths each have their own deep treatment: dry lease vs wet lease aircraft, aircraft leaseback and Part 135, aircraft management company vs charter, and, if you are weighing a certificate, do I need a Part 135 certificate to charter my plane plus how to get a Part 135 certificate.
The Record That Proves Your Structure Is What It Claims to Be
Whichever path your counsel chooses, the structure is only as defensible as the documents that evidence it. An “incidental to the operating business” posture, a dry lease, or a Part 135 certificate each lives or dies on whether you can show who exercises operational control, how the entity is funded, and that the operation matches its paper. None of these is an operations or maintenance system — they are the record that proves your operational-control posture. Keeping that record complete, consistent, and current is a document-management discipline, and it is exactly the discipline FileFlo is built for.
Operating Agreement & Formation Documents
Entity governance · the structure itselfWhat it proves
The LLC operating agreement, ownership records, and any management or services agreements define what the entity is, what it does, and how it is funded. These are the documents that establish whether the flying is incidental to a real business or is the entity’s whole enterprise — the exact question the §1.1 test asks.
How FileFlo tracks it
FileFlo classifies the formation and governance documents as versioned records and retains every amendment with its effective date, so the entity’s stated purpose and funding are documented, not assumed.
Operational-Control Evidence
14 CFR §1.1 (operational control)What it proves
The documentation showing who actually exercised authority over initiating, conducting, and terminating each flight — crew assignment, dispatch and release records, and the operating relationship behind the structure. This is the evidence that operational control sits where the structure says it does, the most contested point in any trap analysis.
How FileFlo tracks it
FileFlo indexes the operational-control evidence against the structure it supports, so substance and paper match — and any gap is visible before someone else finds it.
Lease & Truth-in-Leasing Materials (if applicable)
14 CFR §91.23 (large aircraft)What it proves
If the structure uses a dry lease, the signed lease — and, for U.S.-registered large civil aircraft over 12,500 lbs MTOW subject to exceptions, the §91.23 truth-in-leasing clause, the FAA mailing, the carried copy, and the FSDO notification — proves the lease type and who holds operational control under it.
How FileFlo tracks it
FileFlo keeps the lease and its §91.23 notification evidence linked and version-tracked, with effective dates intact, so the leased structure is provable on demand.
Insurance Certificates
Per policy — named insureds & operation typeWhat it proves
The policy and certificates must name the right parties and cover the operation as it is actually conducted. A policy written for a Part 91 flight when the operation is really commercial is the gap that surfaces — disastrously — at claim time. Matching coverage to the true operation is part of getting the structure right.
How FileFlo tracks it
FileFlo version-tracks each certificate with effective and expiration dates and flags renewals before coverage lapses against the use the structure requires.
Airworthiness & Maintenance Records
Inspections · AD compliance · airworthinessWhat it proves
Regardless of structure, the aircraft’s airworthiness record — annual and required inspections, airworthiness directive compliance, and component/time tracking — must be current. A lapsed inspection grounds the aircraft no matter how clean the entity looks on paper.
How FileFlo tracks it
FileFlo tracks each inspection and AD as a dated record and surfaces the next-due item before it lapses, so the airframe does not quietly fly out of airworthiness.
OpSpecs Listing & Conformity (if certificated)
14 CFR §119.5 / §119.51What it proves
If the chosen path is Part 135 — your own certificate or placement with an operator — the aircraft must be listed on operations specifications and conformed to the program. Adding or amending the tail runs through the OpSpecs amendment process under §119.51, each step producing a dated document.
How FileFlo tracks it
FileFlo retains the conformity records and OpSpecs revisions that show your aircraft’s authorized status on the certificate, with effective dates intact.
Related reading: What records a Part 135 operator must keep · Part 91 corporate flight department records · Truth-in-leasing aircraft lease records (§91.23) · Operations specifications (OpSpecs) explained
FileFlo is the proof layer, not the structure or the advice
FileFlo is a compliance document intelligence platform — it classifies, indexes, version-tracks, and surfaces expirations on the documents that prove your aircraft-ownership structure’s compliance posture: the operating agreement and formation records, the operational-control evidence, any lease and its §91.23 materials, the insurance certificates, the maintenance history, and any OpSpecs listing. It does not structure your entity, decide who has operational control, draft or negotiate your lease, obtain a Part 135 certificate, assess your enforcement or coverage risk, or give legal, tax, or insurance advice. Avoiding the flight department company trap is your aviation attorney’s job; keeping the resulting record complete, consistent, and audit-ready is the document job FileFlo solves. That separation is deliberate — the record that proves your compliance has to be maintained independently from the judgment calls that create it.
Frequently Asked Questions
What is the flight department company trap?
The flight department company trap is a structuring mistake — a term coined by the National Business Aviation Association (NBAA) — in which a business puts its aircraft into a single-purpose entity (often an LLC) whose only function is to own the aircraft and fly the parent company and its principals. The problem is that this entity does nothing else. Because its sole business is providing air transportation, and the related companies pay it (or fund it) for those flights, the FAA can treat the arrangement as carriage for compensation or hire. Part 91 only allows aircraft operations that are incidental to a real, separate business; an entity whose entire business IS the flying fails that test. The result is that a structure built to look like simple Part 91 corporate flying may actually be conducting commercial operations that require a Part 135 certificate — which the entity does not hold. This is a fact-specific legal-structure question; it is general compliance-document information, not legal advice, and the structure must be reviewed by an aviation attorney.
Can an LLC own and operate my airplane?
An LLC can absolutely own an aircraft — single-member LLCs hold aircraft title constantly, and there are sound liability and registration reasons to do so. The trap is not ownership; it is operation. The danger appears when that LLC is also the operator and its only business is flying the aircraft for the people who fund it. At that point the LLC looks like a company whose major enterprise is air transportation for compensation, which Part 91 does not permit and which points toward Part 135. A holding entity that merely owns and registers the aircraft, while operational control sits with a genuine operating business that uses the aircraft incidentally to its real work, is a very different posture from a sole-purpose entity that both owns and operates. Which side of that line your structure falls on depends on the specific facts — who exercises operational control, how the entity is funded, and what else (if anything) it actually does. Confirm the structure with an aviation attorney before relying on it.
Why is a single-purpose flight department company illegal under Part 91?
It is not that an LLC is illegal — it is that Part 91 private operations cannot be conducted for compensation or hire, and a single-purpose flight department company tends to cross that line. The test the FAA uses comes from the definition of commercial operator in 14 CFR §1.1: where it is doubtful that an operation is for compensation or hire, the question is whether the carriage by air is merely incidental to the person's other business or is, in itself, a major enterprise for profit. A company whose ONLY business is owning and flying the aircraft has no other business for the flying to be incidental to — the flying is the whole enterprise. When the parent and affiliates pay that entity (or capitalize it specifically to fund the flights), the FAA can view those payments as compensation for transportation. Compensated carriage that is not incidental to a separate business generally must be conducted under Part 135 (or 121). Operating it under Part 91 without that certificate is the violation. Whether your facts trip the test is a legal question for counsel.
How do I avoid the flight department company trap?
There is no single off-the-shelf fix, and the right answer is genuinely fact-specific, which is why NBAA and aviation attorneys treat it as a structuring exercise rather than a checklist. In broad terms, the structures practitioners discuss include keeping the aircraft inside (or operationally controlled by) the real operating company so the flying stays incidental to an actual business; using a properly papered dry lease so operational control sits with the lessee that has its own separate business purpose; or, where the use is genuinely commercial, obtaining a Part 135 certificate (or placing the aircraft with a certificated operator) so the operation is legal on its own terms. Each path has FAA, tax, insurance, and liability trade-offs that only your own aviation attorney and tax advisor can weigh against your facts. FileFlo does not pick the structure for you. What FileFlo does is keep the resulting records — the operating agreement, the operational-control evidence, any lease, the insurance and maintenance records — organized and provable, so whichever structure your counsel chooses can be evidenced on demand.
What does compensation or hire mean for a flight department company?
Compensation or hire is the phrase that turns private Part 91 flying into a commercial operation, and it is broader than a cash ticket price. The FAA reads compensation expansively — it does not require profit, and it can include indirect value such as cost reimbursement, the assumption of expenses, or capital contributions made to fund the flights. In the flight department company context, the concern is that when affiliates pay the single-purpose entity for trips, or fund it precisely so it can fly them, those flows can be characterized as compensation for air transportation. Combined with the fact that the entity's sole enterprise is the flying (so it cannot claim the flights are incidental to other business), the operation can be pushed across the line into commercial carriage requiring Part 135. The exact contours of what counts as compensation in a given structure are interpreted through FAA legal interpretations and guidance, not a single tidy rule — another reason this belongs with an aviation attorney rather than a blog post.
Is a flight department company the same as common carriage?
No, and the distinction matters. Common carriage requires holding out — offering transportation to the public or a segment of it. A flight department company that only flies its own affiliated companies is usually NOT holding out, so it is typically not common carriage. But that does not make it safe under Part 91. The flight department company trap is a compensation-or-hire problem, not a holding-out problem: even private carriage for compensation (carriage for hire that does not involve holding out) generally must be conducted under Part 135. So the entity can be entirely free of any common-carriage concern and still be operating illegally under Part 91 because the flying is a compensated, non-incidental enterprise. This is exactly why the trap catches careful operators — they correctly conclude they are not a common carrier and wrongly assume that means Part 91 is fine. For the holding-out side of the doctrine, see our explainer on what holding out means in aviation.
What are the consequences of getting caught in the flight department company trap?
The exposure is broader than an FAA enforcement action, though that alone is serious — operating a commercial flight without the required certificate can lead to civil penalties and certificate or airman action. The consequences practitioners most often warn about extend past the FAA. Aviation insurance is frequently written on the assumption the operation is a lawful Part 91 flight; if the operation is actually an uncertificated commercial one, a carrier may dispute or deny a claim, which is the nightmare scenario after an accident. Aircraft finance and lease covenants commonly require lawful operation and can be breached. And the tax posture built on top of the structure can unravel if the operating assumptions underneath it were wrong. None of these are FileFlo determinations — we do not assess your enforcement risk or your coverage. The point is only that the trap is not a paperwork technicality; it reaches insurance, financing, and tax, which is why the structure must be gotten right with counsel before the first flight.
What records does a flight department company need, and what does FileFlo do?
Whether your aircraft ends up inside the operating company, on a dry lease, or on a Part 135 certificate, the same families of documents prove the structure is what it claims to be: the entity's operating agreement and formation documents, the evidence of who actually exercises operational control of each flight, any lease and its truth-in-leasing materials where applicable, the insurance certificates that name the right parties for the actual use, the airworthiness and maintenance records, and — if the aircraft is certificated — its listing on the operator's operations specifications. FileFlo is the compliance document intelligence platform for that record. It classifies, indexes, version-tracks, and surfaces expirations on each of these documents so the operational-control posture and the supporting paper are organized and provable on demand. FileFlo does not structure your entity, decide operational control for you, draft your lease, obtain a Part 135 certificate, or give legal, tax, or insurance advice. The structure is the aviation attorney's job; keeping the resulting record audit-ready is the document job FileFlo solves.
Whatever structure your counsel chooses, keep it provable
FileFlo classifies and version-tracks the full aircraft-ownership document set — the operating agreement, the operational-control evidence, any dry lease and §91.23 materials, the insurance certificates, the maintenance and AD history, and any OpSpecs listing — and surfaces every expiration before it grounds the aircraft or weakens your position. AI document classification. 600+ document types. One-click readiness binder. Starter at $89/mo, Professional at $299/mo. No credit card required for the 5-day free trial.
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Continue your aircraft-structure, leasing & Part 135 reading
Reviewed by Chad Griffith, Founder, FileFlo — compliance document intelligence. Last reviewed June 15, 2026. Regulatory citations verified against the Cornell Legal Information Institute (14 CFR §1.1 operational control and commercial-operator definitions, §119.1 applicability, §91.23 truth-in-leasing) as of publication date; the “flight department company trap” is a term coined by the National Business Aviation Association (NBAA), and the common-carriage / holding-out / private-carriage doctrine is framed per FAA Advisory Circular 120-12 (AC 120-12A), which is guidance, not a single CFR section. This is general compliance-document information, not legal, tax, or insurance advice; whether a particular structure falls into the trap is fact-specific — consult an aviation attorney for the legal and FAA questions and a CPA or tax advisor for the tax questions.