Direct Answer
An illegal charter — or "grey charter" — is the carriage of passengers or property for compensation when the operator does not hold the air carrier or operating certificate that 14 CFR Part 119 requires. The flight looks like a normal charter, but it is missing the Part 135 certificate, the operations specifications, and the safety and insurance framework that come with them.
The FAA treats illegal charter as a top enforcement priority. It runs a public "Safe Air Charter" reporting campaign with a hotline (1-888-759-3581, also published as 1-888-SKY-FLT1), and a Special Emphasis Investigations Team for the complex, document-heavy cases. Investigations typically start from a tip, public marketing, a broker reselling an uncertificated operator, or a sham "dry lease" that is really a wet lease.
The dollar figures are real: in a single August 5, 2021 action the FAA proposed $1,228,671 in civil penalties against five companies, and on February 2, 2023 it proposed $1,037,478 against one Kansas operator for 78 uncertificated flights. A legitimate operator proves it is legal the same way it survives an audit — by producing a current certificate, current OpSpecs, operational-control documentation, and clean pilot, maintenance, and lease records on demand.
Why "Grey Charter" Is the Term — and Why It Is Dangerous
The word "grey" implies a grey area, and that framing is exactly the trap. There is no grey area in the regulation itself. Either the operator holds the certificate Part 119 requires for the carriage it is conducting, or it does not. What is "grey" is the marketing and paperwork wrapped around the flight to make uncertificated commercial carriage look like something else — a private flight among friends, an aircraft "dry leased" to the passenger, a "cost-share." From the passenger's seat, a grey charter and a legal charter are indistinguishable: same jet, same FBO, same uniformed pilots. The difference is invisible until something goes wrong — and then it is total, because the insurance written for a private operation typically does not respond to an uncertificated commercial flight.
That is why the FAA, the National Air Transportation Association, and the air-charter community treat illegal charter as a safety problem, not merely a paperwork one. A certificate is not bureaucratic friction; it is the gateway to the entire Part 135 regime — recurrent pilot training and checkrides, duty and rest limits, weather minimums, an approved maintenance program, drug-and-alcohol testing, and operational-control accountability. Strip the certificate away and you strip all of that away with it, while still selling the flight as if it were there.
This article walks the whole picture: exactly where the legal line sits in Part 119 and Part 135, what Part 91 actually permits (and where those permissions get abused), what triggers an FAA investigation, the real dated enforcement actions, how to report a suspected illegal charter, and — because this is a compliance-records publication — the document set a legitimate operator keeps so a broker vet, an insurer, or an inspector never mistakes it for a grey operation. For the foundational distinction underneath all of this, start with Part 91 vs. Part 135 and what "compensation or hire" really means.
The insurance gap is the quiet catastrophe
In an accident during an illegal charter, the aircraft insurer can deny coverage because the aircraft was operated outside the use the policy was written for. The operator faces FAA penalties and certificate action, the broker who arranged the trip faces negligence exposure, and the passengers — who thought they bought a regulated charter — may have no aviation coverage behind them at all. The certificate is what makes the safety and insurance framework real.
Where the Legal Line Actually Sits: Part 119, Part 135, and Part 91
The line is drawn by 14 CFR §119.1. It provides that a person operating a civil aircraft as an air carrier or commercial operator in air commerce must hold an air carrier or operating certificate and conduct those operations under the applicable rules — Part 121 for larger scheduled and certain other operations, and Part 135 for commuter and on-demand operations. Section 135.1(a) confirms the reach of the on-demand rules: Part 135 governs the commuter or on-demand operations of each person who holds or is required to hold a certificate under Part 119. The phrase "is required to hold" is the key — an operator does not escape Part 135 by simply not getting the certificate. If the carriage requires one, flying without it is the violation.
Section 119.1 also lists, in paragraph (e), operations that are not governed by the certification framework — and grey-charter promoters love to misread it. The carve-outs cover things like student instruction, nonstop commercial air tours within a 25-statute-mile radius under stated limits, ferry and training flights, and aerial work such as crop dusting, banner towing, aerial photography, and firefighting. These are genuine exceptions, but they are narrow and specific. None of them authorizes selling point-to-point passenger transportation to the public. Reading "aerial work is exempt" as "my passenger flight is exempt" is a category error that has ended in seven-figure penalties.
On the other side is 14 CFR §91.501, the Part 91 Subpart F rule that genuinely permits certain non-certificated operations for large airplanes and turbojet-powered multiengine airplanes. Within stated conditions it allows ferry and training flights, demonstrations to prospective buyers without charge, carriage of company officials and employees and property at cost, and three named structures — time-sharing (the aircraft with crew, with charges limited to those §91.501(d) specifies), interchange (trading equal aircraft time between operators), and joint ownership (registered co-owners sharing costs per agreement). These are real, legal arrangements. They are also bounded: each has conditions on who may be carried, what may be charged, and how the costs are shared.
The one question that decides the case
Across illegal-charter analysis, two facts do most of the work: (1) was there compensation or hire, and (2) who held operational control — the authority over initiating, conducting, and terminating the flight, as defined in 14 CFR 1.1. If a non-certificated party both got paid and controlled the flight, the structure on paper rarely saves it.
Operational control is not just a definitional point — it is the operator's affirmative duty. 14 CFR §135.77 makes each Part 135 certificate holder responsible for operational control and requires the certificate holder to list, in its manual, each person authorized to exercise it. That is why grey-charter cases so often turn on a lease or a chain of emails: the documents reveal who was really deciding whether, when, and where the airplane flew. For the full treatment, see what operational control means in Part 135 and the truth-in-leasing records required by §91.23.
What Triggers an FAA Illegal Charter Investigation
Illegal charter is hard to observe from the outside — the airplane looks legitimate, the crew looks professional — so enforcement almost always starts with one of a handful of triggers, and is then built out from documents. Here are the patterns investigators act on most.
A tip to the Safe Air Charter hotline or an FSDO
The single most common starting point. The FAA runs a public reporting hotline and an FSDO/email intake under its Safe Air Charter campaign, and a large share of cases begin with a call from a competitor, a passenger, or a fixed-base operator who watched a paid flight load without a certificated operator behind it.
Public marketing that holds the aircraft out for hire
Advertising a specific aircraft to the general public for paid flights — on a website, a social feed, or a listing — without naming the certificated operator in operational control is a classic flag. Holding out to the public for compensation is the conduct Part 119 reserves to certificate holders.
A broker reselling an uncertificated operator
When a charter broker arranges a trip that turns out to be flown by an operator with no Part 135 certificate, the broker, the operator, and the flight all draw scrutiny. Brokers are expected to use only duly authorized direct air carriers — which is why broker vetting now routinely asks for certificate and OpSpecs documentation up front.
A sham "dry lease" that is really a wet lease
The highest-risk document pattern. A genuine dry lease provides the aircraft only; the lessee supplies its own crew and exercises operational control. When the same party that leases you the airplane also provides the pilots, the FAA treats it as a wet lease — which requires a certificate. Sham dry-lease schemes are a stated focus of FAA and DOJ action.
A "cost-share" stretched past what Part 91 allows
Part 91 permits real cost-sharing and the §91.501 arrangements within limits. The problem starts when one party to a "cost-share" or "time-share" is in substance a paying customer, converting a permitted private flight into uncertificated commercial carriage. The label does not control — the substance does.
Flight-tracking and payment patterns
Investigators corroborate tips with publicly available flight data, repeated point-to-point patterns inconsistent with private use, and — once an investigation opens — the financial trail of who paid whom. Illegal charter is hard to see from outside the cockpit, so the case is usually built from documents.
Once a report reaches the FAA, the agency's described process is to forward it for review and generally refer it to the local Flight Standards District Office (FSDO), with the Special Emphasis Investigations Team (SEIT) also positioned to receive reports and work the complex cases. The SEIT exists precisely because the hardest illegal-charter cases — the layered sham-lease and shell-company structures — require financial records, subpoenas, and document analysis that a routine inspection cannot reach. The U.S. Department of Justice has also brought federal action over sham dry-lease schemes, underscoring that the exposure is not always confined to civil aviation penalties.
The paperwork is the case — for both sides
Because illegal charter is proven through documents, the document trail cuts both ways. For an illegitimate operator, the sham lease and the payment record are the evidence against it. For a legitimate operator wrongly suspected, the certificate, OpSpecs, operational-control records, and clean lease are the defense. In an enforcement posture, the operator that can produce its records on the first request is in a completely different position from the one reconstructing them under a deadline.
Every trigger above is answered by a document. See where your certificate, OpSpecs, and operational-control records stand in two minutes.
The Recent Actions: Real, Dated, and Seven Figures
The crackdown is not rhetorical. The FAA pursues uncertificated commercial operations as civil-penalty cases, and it publishes them. Two well-documented actions illustrate the scale and the conduct at issue.
$1,228,671 against five companies
FAA press release · Aug. 5, 2021In a single announcement, the FAA proposed civil penalties totaling $1,228,671 against five companies for allegedly conducting illegal charter flights without the required air carrier or operating certificate. Reported examples from the action included an Iowa operator hit with a $344,672 proposed penalty for 16 paid passenger-carrying flights in a twin-engine Cessna Conquest, and a related entity proposed at $301,676 for 43 such flights — both without a required certificate. The action is a clean illustration of how the penalties scale per flight: the more uncertificated trips flown, the larger the proposed figure.
Proposed civil penalties are allegations; companies are entitled to respond before any penalty is finalized.
$1,037,478 against one Kansas operator
FAA action · Feb. 2, 2023The FAA proposed a $1,037,478 civil penalty against a Kansas operator (Aircraft Resource Management) for allegedly conducting 78 charter flights without proper FAA certification or qualified pilots, using six different twin-engine aircraft. The "without qualified pilots" element is the tell: grey charter does not just skip the certificate, it skips the Part 135 pilot regime — the checkrides, currency, and duty/rest rules that ride on top of it.
Figures and conduct as reported in the FAA action and contemporaneous trade-press coverage.
These are representative, not exhaustive. The FAA has brought a series of illegal-charter actions in recent years and maintains a public list of rogue-operator enforcement actions as part of its Safe Air Charter effort; trade associations including the National Air Transportation Association have repeatedly flagged that illegal charter activity persists despite enforcement. The point for an operator is not the specific dollar amount in any one case — it is that the FAA treats uncertificated commercial carriage as a per-flight civil-penalty matter with real, published numbers, and that the cases are won or lost on documents.
It is not only the company that is exposed
Illegal-charter enforcement reaches people, not just entities. The FAA can pursue certificate action against the pilots who flew the trips — suspension or revocation of airman certificates — and willful violations can carry criminal exposure under the U.S. Code. A pilot who agrees to fly what they suspect is a grey charter is putting their own certificate on the line, and an accident during such a flight layers civil liability and insurance denial on top.
For the buyer side of the relationship, a charter broker that resells an uncertificated operator has its own exposure — which is why broker compliance now routinely requires certificate and OpSpecs verification before booking. See charter broker compliance under 14 CFR Part 295.
If a broker or insurer asked today, could you prove your operation is legal — on the first request?
FileFlo classifies and indexes the documents that prove a legitimate Part 135 operation — certificate, OpSpecs, operational-control records, pilot and maintenance records, leases and broker agreements — ties them to aircraft and dates, alerts on expirations, and assembles an audit-ready binder on demand. 600+ document types. Starter at $89/mo, Professional at $299/mo. 5-day free trial, no credit card required.
How to Report a Suspected Illegal Charter
The FAA runs a dedicated Safe Air Charter campaign with several reporting paths. You do not need to build the case — you provide what you observed, and the FAA decides whether to investigate.
The Safe Air Charter hotline
1-888-759-3581
Also published as 1-888-SKY-FLT1. The fastest path; reports are forwarded to and reviewed by the FAA.
Email, FAA Hotline, or your local FSDO
The Safe Air Charter program (faa.gov/charter) lists an email path, the general FAA Hotline, and direct contact with a Flight Standards District Office. Any of them routes the report into the same review process.
What to include in a report
The operator and aircraft
Company or individual name, tail number (N-number) if known, aircraft type, and the FBO or airport involved
The marketing or arrangement
Where the flight was advertised or how it was arranged — a website, a listing, a broker, a social post — and any claim about who would operate it
The circumstances of the flight
Date and route if known, that passengers paid or compensation changed hands, and anything suggesting no certificated operator was in control
How the FAA routes it
Reports are reviewed and generally referred to the local FSDO; the Special Emphasis Investigations Team may also receive them for initial analysis
A note on motive: legitimate operators are often the ones reporting, because grey charter undercuts them on price by skipping the cost of compliance, and it endangers the public flying on the same routes. Reporting is not just competitive self-interest — the entire premise of the Safe Air Charter campaign is that an uncertificated operation is a safety hazard to its passengers.
How a Legitimate Operator Proves It Is Flying Legally
Here is the part that matters most to the operators reading this: being legal is not the same as being able to prove it. The FAA's illegal-charter framework is documentary at its core — the question in every case is which records show who held the certificate, who controlled the flight, and what the arrangement really was. A legitimate operation that cannot locate its certificate, has let its OpSpecs amendments fall out of order, or cannot produce a pilot record will struggle in exactly the same way an illegitimate one does — not because it did anything wrong, but because the proof is not at hand.
The same gap shows up commercially, well before any FAA contact. When a sophisticated charter broker or an insurer vets an operator, they ask for documents — a current certificate, OpSpecs covering the trip, evidence of operational control, pilot currency. A lapsed certificate, an expired OpSpec, or a missing pilot record can fail the vet and lose the booking, even though the operation is entirely legitimate. The operators who win on this front are the ones whose proof is organized, current, and producible on demand.
The record set that proves legality, document by document
Air carrier / operating certificate
14 CFR Part 119Why it proves legality
The threshold document. A legitimate on-demand operator holds the certificate Part 119 requires for the kind of carriage it sells. In any illegal-charter inquiry — and in any serious broker or insurer vet — the certificate is the first thing requested. An expired or surrendered certificate, or one that does not cover the operation actually flown, is the whole case.
How FileFlo helps
FileFlo classifies the certificate as a tracked document, stores the current version, and surfaces it instantly — so the question "are you certificated for this?" is answered with a document, not an assertion.
Current operations specifications (OpSpecs)
14 CFR Part 119 / Part 135Why it proves legality
OpSpecs are where the authority actually lives — which aircraft, which kinds of operations, which areas. A flight outside the OpSpecs is, in substance, an unauthorized operation even for a certificate holder. Brokers increasingly ask to see OpSpecs coverage for the specific trip before booking.
How FileFlo helps
FileFlo indexes OpSpecs as a distinct document type and version-controls amendments, so the authorization in force on the date of a given flight is retrievable rather than reconstructed.
Operational-control documentation
14 CFR §135.77 / 14 CFR 1.1Why it proves legality
The decisive question in nearly every illegal-charter and grey-charter case is who exercised operational control — authority over initiating, conducting, and terminating the flight. Section 135.77 makes the certificate holder responsible for it and requires the manual to list who may exercise it. The proof that the certificate holder, not a broker or a customer, was in control is documentary.
How FileFlo helps
FileFlo keeps the management-personnel and operational-control records organized and tied to the manual, so the "who was in control" question has a paper answer on file.
Pilot qualification and currency records
14 CFR Part 135 Subpart E/GWhy it proves legality
Part 135 imposes a pilot regime — checkrides, recurrent training, currency, duty and rest — that grey charter skips. Producing current pilot records is part of proving the flight was a real Part 135 operation flown by qualified, current crew, not an uncertificated trip with a willing pilot.
How FileFlo helps
FileFlo tracks pilot records with expiration alerting, so a lapsing checkride or medical surfaces before it becomes a finding — or a failed vet.
Aircraft maintenance records
14 CFR Part 135 / Part 91Why it proves legality
A certificated operation maintains its aircraft under an approved program with documented inspections and airworthiness. The maintenance trail is part of the package an inspector — or an insurer after an incident — uses to distinguish a regulated operation from an uncertificated one.
How FileFlo helps
FileFlo classifies and dates maintenance and airworthiness documents and tracks recurring inspection deadlines, keeping the airworthiness story continuous and producible.
Lease and broker agreements
14 CFR §91.23 / 14 CFR Part 295Why it proves legality
Because sham leases are the highest-risk pattern, the lease documents themselves are evidence. A genuine dry lease, the truth-in-leasing notification under §91.23 where it applies, and clean broker agreements that name the certificated operator all help show the arrangement is what it claims to be. The document that disguises commercial carriage is the document that proves the violation.
How FileFlo helps
FileFlo stores leases, truth-in-leasing records, and broker agreements as tracked document classes tied to the aircraft and counterparty, so the arrangement behind a flight is documented, not verbal.
None of these documents is exotic — they are the same records a Part 135 certificate holder is already required to keep. The failure mode is rarely "the operator never had the document." It is "the operator could not find the current version fast enough, in the form the situation demanded." That is the gap between a clean operation and a clean provable operation, and it is a document-management problem rather than a flying problem. For the full operator records picture, see what records a Part 135 operator must keep, the pilot records the FAA requires, and the required management-personnel qualifications behind your operational-control structure.
Single-pilot and small operators are not exempt from this discipline — if anything, they feel it more, because the same person flying the airplane is the one expected to produce the paperwork. See the records a Part 135 single-pilot operator keeps and, for the broader inspection posture, how to prepare for a Part 135 surveillance audit. The forward-looking obligation worth tracking now is the Part 135 SMS mandate and its 2027 deadline, detailed further in the Part 135 SMS requirements.
FileFlo is the proof layer — not the certificate, the operation, or the law firm
FileFlo is a compliance document intelligence platform: it classifies the documents in this article, indexes them by aircraft, counterparty, and date, tracks expirations on the time-sensitive ones (certificates, OpSpecs amendments, pilot currency, insurance), and keeps the whole set retrievable for a broker vet, an insurer, or an FAA inquiry. It does not obtain your certificate, file your application, write your manuals, interact with the FAA, broker deals, or give legal advice — and it does not need to. The problem it solves is proving, on demand, that a legitimate operation is exactly what it says it is.
Frequently Asked Questions
What is an illegal charter?
An illegal charter (often called a "grey charter") is the carriage of passengers or property for compensation or hire on an aircraft when the operator does not hold the air carrier or operating certificate that 14 CFR Part 119 requires for that kind of flight. The line is drawn by Part 119: under §119.1, a person operating as an air carrier or commercial operator in air commerce must hold a certificate and operate under Part 121 or Part 135. When money (or other compensation) changes hands for a flight, and the operator initiating, conducting, and terminating that flight has no certificate authorizing on-demand carriage, the flight is illegal — no matter how nice the airplane is or how experienced the pilot.
What is a grey charter, and how is it different from a legal charter?
"Grey charter" is industry slang for a flight that is sold and flown like an on-demand charter but operated outside a Part 135 certificate — usually by dressing it up as something Part 91 allows. A legal charter is flown by a Part 135 certificate holder under its operations specifications, with the certificate holder in operational control. A grey charter looks identical from the passenger's seat but is missing the certificate, the OpSpecs, the Part 135 pilot and maintenance regime, and — critically — the insurance and safety framework that ride along with it. The aircraft and crew may be excellent; the legal and insurance structure is the problem. The FAA treats the difference as the difference between a regulated common carrier and an uncertificated operator.
What triggers an FAA illegal charter investigation?
Common triggers include: a tip to the FAA's Safe Air Charter hotline or a Flight Standards District Office (FSDO) — often from a competitor, a passenger, or a fixed-base operator; public marketing or social media that holds the aircraft out to the general public for paid flights without naming a certificated operator; brokers reselling flights that turn out to be flown by an uncertificated operator; and document patterns that look like a sham — for example, a "dry lease" that is really a wet lease in disguise (the same party that leases you the airplane also provides the crew), or a Part 91 cost-sharing arrangement stretched past what §61.113 or §91.501 actually allows. Once a report reaches the FAA, it is generally referred to the local FSDO, and the agency's Special Emphasis Investigations Team may also review it before an investigation opens.
How does the FAA find illegal charter operators?
Several ways at once. The FAA runs a dedicated Safe Air Charter campaign with a public reporting hotline (1-888-759-3581, also reachable as 1-888-SKY-FLT1) and an email and FSDO reporting path, so much of the intake is tips. It also stood up a Special Emphasis Investigations Team to work the more complex, document-heavy cases — the dry-lease-that-is-really-a-wet-lease patterns that take subpoenas and financial records to unwind. Investigators look at flight tracking, marketing and broker listings, lease documents, who paid whom, and who actually controlled the flight. Because illegal charter is hard to prove from the outside, the paper trail — leases, invoices, manifests, who hired the crew — is usually where the case is made or broken.
What are the penalties for operating an illegal charter?
The FAA pursues uncertificated commercial operations as civil-penalty cases, and the dollar figures are real. On August 5, 2021, the FAA announced proposed civil penalties totaling $1,228,671 against five companies for allegedly conducting illegal charter flights without the required certificate. On February 2, 2023, it proposed a $1,037,478 penalty against a single Kansas operator (Aircraft Resource Management) for allegedly conducting 78 charter flights without proper FAA certification or qualified pilots. Beyond civil penalties, the FAA can pursue certificate action against the pilots involved (suspension or revocation of airman certificates), and willful violations can carry criminal exposure under the U.S. Code. The penalties scale per flight, so a season of grey-charter trips compounds quickly.
How do I report an illegal charter to the FAA?
The FAA's Safe Air Charter campaign provides several reporting paths. The fastest is the hotline: 1-888-759-3581 (also published as 1-888-SKY-FLT1). You can also email the Safe Air Charter program, use the FAA Hotline, or contact your local Flight Standards District Office (FSDO) directly. Reports are forwarded to and reviewed by the FAA; the agency generally refers them to the relevant FSDO, and the Special Emphasis Investigations Team may also receive them for initial analysis. You do not need to prove the case yourself — you provide what you observed (the operator, the aircraft, the marketing, the circumstances of the flight) and the FAA decides whether to investigate.
Is cost-sharing or a dry lease a way around Part 135?
Not as a workaround. Part 91 genuinely permits several non-certificated arrangements — but only inside narrow limits. Under §91.501, large-airplane and turbojet operators can run time-sharing, interchange, and joint-ownership arrangements, and carry company officials at cost, when the conditions are met. Private pilots can share certain expenses under §61.113. The illegality starts when those structures are used to disguise what is really commercial carriage: a "dry lease" where the lessor also supplies the crew is a wet lease, which requires a certificate; a "cost-share" where one party is really a paying customer is charter. The FAA and DOJ have pursued operators over exactly these sham-dry-lease schemes. The arrangement is judged by its substance — who controlled the flight and who really paid — not by the label on the document.
How can a legitimate Part 135 operator prove it is flying legally?
By keeping the proof current and producible. A legitimate operator holds a Part 135 air carrier or operating certificate and operations specifications authorizing the flights it sells; it can show that the certificate holder — not a broker or a customer — was in operational control of each flight; and it can produce the records that demonstrate it: current OpSpecs, the management-personnel and operational-control documentation, pilot qualification and currency records, maintenance records, and, increasingly, the broker agreements behind resold trips. When a charter broker or an insurer vets you, a lapsed certificate, expired OpSpecs, or a pilot record you cannot locate can fail the vet even though your operation is entirely legitimate. Legality is not just being legal — it is being able to prove it on demand. That is a document-management problem.
Don't fail a broker vet on a lapsed certificate. Keep your proof of legality current — and producible.
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Reviewed by Chad Griffith, Founder, FileFlo — compliance document intelligence — June 15, 2026. Regulatory citations verified against the Code of Federal Regulations (Cornell LII) as of publication date; enforcement figures cited to dated FAA actions (Aug. 5, 2021 and Feb. 2, 2023). Not legal advice.