Part 135 vs Part 91: What the Rules Mean When You Charter a Jet

01 / Industry Explainers

The Three Rulebooks of U.S. Aviation

The Federal Aviation Regulations divide flying into operating rules, and three matter here:

Part 91 is the general aviation rulebook — the rules a private owner follows flying their own airplane. It's not lax, but it assumes the person taking the risk is the person choosing to fly.

Part 135 exists because paying passengers can't inspect maintenance logs or evaluate pilot proficiency. So the FAA does it for them, through an air carrier certificate that the operator must earn and continuously defend.

02 / Industry Explainers

What a Part 135 Certificate Actually Requires

When you book with a certificated charter operator, the rules underneath your flight change in concrete ways:

• Pilot requirements rise. Part 135 captains must meet higher minimum flight-time requirements, pass recurrent checkrides, and observe strict duty-time and rest limits. There is no legal all-nighter to get you home.
• Maintenance is a program, not a habit. Aircraft follow an FAA-accepted maintenance and inspection program with continuous oversight — not just the annual inspection a private owner needs.
• Drug and alcohol testing is mandatory for pilots and safety-sensitive personnel, on a random, ongoing basis.
• Operational limits tighten. Part 135 imposes stricter weather minimums, runway-length margins, and fuel reserves than Part 91 allows.
• The FAA is in the building. Certificate holders answer to assigned FAA inspectors, hold operations specifications defining exactly what they may fly and where, and can lose the certificate for cutting corners.

03 / Industry Explainers

The Gray Market: Illegal Charter

Here's why this matters beyond trivia. There is a persistent gray market in which Part 91 flights are sold, disguised, as charter — a practice the FAA and the industry call illegal charter. The schemes vary: "dry lease" arrangements where the paperwork says you leased the airplane and separately hired the crew, cost-sharing that stretches far past what the rules allow, or simply an owner's pilot flying paying strangers with no certificate at all.

The passenger almost never knows. The tell-tale signs:

• A price dramatically below every other quote. Skipping Part 135 compliance is cheap; that's the point.
• Vagueness about who the operator is. Every legal charter flight has a certificate holder in operational control. If nobody can name it, walk away.
• Paperwork that calls you a lessee or asks you to sign anything describing the flight as private carriage.
• No tail number or operator name until the last minute.

The risks aren't theoretical: insurance on an illegally chartered flight may be void, the pilots may not meet commercial standards, and the FAA levies substantial civil penalties — enforcement actions in recent years have targeted schemes involving hundreds of illegal flights.

04 / Industry Explainers

How to Verify an Operator in Five Minutes

A note before the list: verification is not an insult, and no legitimate operator treats it as one. Charter professionals field these questions constantly — from brokers, from corporate flight departments, from insurers — and the good ones have the answers pre-packaged. The only party a verification request inconveniences is the one with something to hide, which is precisely why it works as a filter.

1. 01Ask for the certificate holder's name. Not the broker's — the operator whose certificate the flight runs under. Confusion or evasion here ends the conversation.
2. 02Ask for the air carrier certificate number, and confirm the aircraft appears on the operator's FAA operations specifications (the "D085" list). Any legitimate operator answers instantly.
3. 03Check third-party safety audits. ARGUS ratings and Wyvern certification both start from verified Part 135 status and audit upward from there.
4. 04Look at the operator's profile and reviews. CheckBravo operator profiles show certificates, fleet, and verified passenger reviews side by side — the pattern of a real, functioning charter operation is hard to fake.
5. 05Route your request through channels that pre-verify. A quote request on CheckBravo only reaches audited Part 135 operators, which removes the gray market from the conversation entirely.

05 / Industry Explainers

Why Operators Obsess Over This Line

It helps to understand the economics from the operator's side, because it explains both the gray market and the loud industry campaigns against it. Running a Part 135 operation means carrying costs a private owner never sees: initial and recurrent simulator training for every pilot, an FAA-accepted maintenance program with its own staffing, drug-and-alcohol testing programs, ops manuals, safety management systems, and commercial insurance premiums that dwarf private coverage. Those costs exist precisely because they buy margin — of pilot skill, of mechanical reliability, of decision-making under pressure.

An illegal charter skips most of that cost structure and prices accordingly. The passenger sees a jet, a crew, and a number 30% below market, with no visible difference — until something goes wrong and the differences become the whole story. Voided insurance is the one that catches sophisticated buyers off guard: policies are written for the operation the paperwork describes, and a "dry lease" that a court later reads as an illegal charter can leave everyone involved uncovered at the worst possible moment.

The good news is that the legitimate market has never been easier to see. Operator transparency — public certificates, audit ratings, verified reviews — has turned what used to be an insider's diligence process into a few minutes of reading. The gray market survives on buyers who don't look.

06 / Industry Explainers

Where Part 91 Legitimately Touches Your Trip

None of this makes Part 91 sinister — it's how owners fly their own aircraft, how corporate flight departments carry their own employees, how fractional shares operate under their own rules (Part 91 Subpart K, with its own oversight regime), and how repositioning flights without passengers are often flown. You may well ride on a Part 91 flight someday as an owner's guest, entirely legally, with nothing exchanged but hospitality. The line is simple: the moment a member of the public pays for transportation, the flight belongs under a commercial certificate.

That's also why the charter industry polices this so loudly. Legitimate operators carry the full cost of compliance — training, maintenance programs, audits, insurance — and get undercut by operators who don't. When you verify the certificate, you're not being paranoid; you're pricing safety back into the market.