Choosing a Charter Operator: AOC, Safety Audits and Red Flags

The company that flies the aircraft, not the broker or the app that sells the trip, is responsible for its safety. Vetting a charter operator comes down to five things: a valid air operator certificate that covers the specific aircraft, insurance for commercial use, credible third-party audits, an experienced crew and no sign of grey charter. All of them can be checked before you pay, and a good operator expects you to ask.

1. The air operator certificate

Commercial passenger flights need an air operator certificate, or AOC, issued by a national aviation authority. In Europe that happens under EASA rules; in the United States, charter operators hold a certificate under Part 135. The certificate comes with operations specifications that list the aircraft the operator may use. Ask for the operator's legal name, AOC number and issuing authority, and confirm that the aircraft's registration appears on that certificate. An aircraft flown privately for its owner may look identical in every way, but it may not be sold for charter. The difference between private and commercial rules is explained in Part 91, Part 135 and EASA rules.

2. Insurance

Ask for a certificate of insurance and read it. It should name the operator, cover the aircraft for commercial charter, be valid on your dates and show the hull and liability cover, including passenger liability. EU rules set minimum liability cover per passenger, and established operators often carry considerably more. Corporate clients sometimes ask to be named as an additional insured.

3. Third-party safety audits

Independent audits do not replace the regulator, but they show that someone outside the company has examined its safety management, records and procedures. Three names come up most often:

• ARGUS rates operators in tiers called Gold, Gold Plus and Platinum, with the top tier based on an on-site safety audit.
• Wyvern runs the Wyvern Wingman standard, an on-site audit of the operator's base, pilot and maintenance records and operating procedures.
• IS-BAO, the International Standard for Business Aircraft Operations managed by the International Business Aviation Council, registers operators in three stages, from a safety management system that has been established (stage 1) to one fully embedded in the company's culture (stage 3).

Audits are snapshots in time. Ask for the date of the latest audit and make sure it belongs to this operator, not to a partner or to the broker.

4. Crew and aircraft

Ask who will fly the trip. Useful questions: will there be two pilots, even if the type is certified for one; how much experience do the captain and first officer have in total and on this type; is recurrent training done in a full flight simulator; and how will crew duty limits work on a long day with several sectors. On the aircraft itself, ask for the year of build and the maintenance provider, and whether the aircraft offered is the one that will fly or merely an example of the type.

5. Grey charter and how to spot it

Grey charter, also called illegal charter, is a flight sold for payment without an AOC behind it, often in an owner's aircraft operated under private rules. From the cabin it may look identical. The risks are not: the insurance may not cover a commercial flight, the crew and maintenance may not meet commercial standards, and liability after an incident can fall into a gap. Red flags include:

• A price well below other quotes for the same class and route
• No operator name or AOC number in the contract, or the answer that the flight is private
• Payment requested to an individual, the pilot or an owner's holding company
• Suggestions to describe yourself as a friend, to share costs, or to lease the aircraft and hire the crew separately
• Reluctance to show an insurance certificate

The short checklist

1. Operator legal name, AOC number and issuing authority, in writing
2. Aircraft registration listed on that AOC
3. Insurance certificate for commercial operations on your dates
4. Current ARGUS, Wyvern or IS-BAO status, with dates
5. Clear answers on crew experience and training
6. A contract that names the operator as the carrier
7. Payment to a company account, never to a person

If you book through an intermediary, the same list applies; the article on brokers and operators explains why, and the charter contract covers what to read before you sign.

Questions

What is an AOC in private aviation?

An air operator certificate is the approval a national aviation authority issues to a company, allowing it to carry passengers commercially. It lists the aircraft the company may use. Any charter flight you pay for should be operated by an AOC holder with that aircraft on its certificate.

What do ARGUS and Wyvern ratings mean?

They are independent safety audits of charter operators. ARGUS awards tiers called Gold, Gold Plus and Platinum, and Wyvern's main standard, Wyvern Wingman, rests on an on-site audit. They add assurance beyond the regulator but are snapshots, so check that the rating is current and belongs to the operator flying your trip.

What is grey charter?

Grey or illegal charter is a flight sold for payment by someone without an air operator certificate, typically using a privately operated aircraft. It can leave passengers without valid insurance and outside commercial safety standards. Unusually low prices and payments to individuals are typical warning signs.

How can I check that a charter operator is legitimate?

Ask for the operator's legal name, AOC number and issuing authority, and confirm that the aircraft is on that certificate. Request an insurance certificate covering commercial operations and the dates of any third-party audits. A legitimate operator provides all of this without hesitation.

Figures checked 19 October 2026. Prices are indicative and never a quote. Seen something out of date? Tell the editors.