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How charter works

What Is a Part 135 Operator?

Every flight we arrange is operated by an air carrier certificated under Part 135 of the federal aviation regulations. That sentence appears all over this site, and it is doing more work than it looks like — because the certificate is the line between a charter flight and a private aircraft someone is selling seats on.

Altessair · August 21, 2026 · 3 min read

A private jet's polished nose beneath a hangar roof

The certificate

Part 135 is the section of the federal aviation regulations that governs on-demand commercial flying. An operator holding a Part 135 certificate has satisfied the FAA on the things a paying passenger never sees: crew training and rest rules, maintenance programs, drug and alcohol testing, operational procedures, and ongoing surveillance. Holding it is expensive and losing it is easy, which is precisely what makes it meaningful.

The certificate belongs to the operator — never to us. A charter broker arranges the flight and a Part 135 air carrier performs it. Any broker who blurs that line in their marketing is describing a company that does not exist.

Operational control

Operational control is the regulatory term for who actually runs the flight: the crew assignments, the maintenance state of the aircraft, the fuel decision, the weather call, the authority to cancel. On every trip we arrange, that authority sits with the operator, and it should. The pilot who delays your departure for a storm cell answers to a certificate holder with everything to lose — not to a sales target.

Why the specific aircraft matters

A Part 135 certificate is not a blanket over everything an operator owns. Each aircraft flown commercially must be listed on the operator's operations specifications — the FAA-approved document that says which tails, and for what kind of flying, the certificate covers. An aircraft can be beautiful, well-maintained and legally useless for charter because it is not on anyone's ops specs.

This is the check most often assumed rather than made, and it is the first of the five we make before an operator's aircraft appears in one of your quotes.

The gray market

Part 91 is the part of the regulations that covers private, non-commercial flying — an owner flying their own aircraft. It is perfectly legal and much less demanding, because nobody on board is a paying customer. The gray market is what happens when someone sells charter on a Part 91 aircraft anyway: the passenger pays commercial money for a flight held to private standards, usually without knowing it, and typically without the insurance responding the way they assume it would.

The defense is one question: which Part 135 certificate holder is operating my flight? A legitimate broker answers with a company name and will show you the paperwork. If the answer is vague, the price explains itself.

What we check, so you don't have to

Before quoting any operator we confirm the certificate is current, the specific aircraft is on their ops specs, the insurance certificate is on file with its limits and expiry recorded, and any third-party audit standing — ARGUS, WYVERN or IS-BAO — is noted with the date awarded. Those records expire on a calendar, so they are re-checked rather than trusted. You can ask us for the paperwork on any trip we arrange; that is a reasonable question, and you should ask it of every broker you use.