ACMI aviation is a form of wet leasing in which one airline supplies an aircraft together with the crew, maintenance, and insurance needed to operate it for another airline or customer. The provider remains the operating carrier; the customer buys temporary capacity without building the entire operation itself.
For pilots, ACMI can mean rotational work, changing bases, and flying on behalf of several customer airlines. For passengers, it can mean that the airline operating the aircraft is different from the airline that sold the ticket.
What does ACMI stand for?
- Aircraft: the provider makes an aircraft available for the agreed operation.
- Crew: the provider supplies the flight crew and, in a conventional wet lease, the required cabin crew.
- Maintenance: the provider remains responsible for the aircraft’s continuing airworthiness and maintenance arrangements.
- Insurance: the provider carries the aviation insurance required under the agreement and applicable law.
The exact commercial division is defined by the contract. The customer commonly remains responsible for areas such as schedules, ticket sales or cargo sales, fuel, airport charges, ground handling, and catering, but those items should never be assumed without reading the agreement.
Is ACMI the same as a wet lease?
In normal airline usage, ACMI describes a full wet-lease package. European operating rules define a wet lease by operational responsibility: for commercial air transport, the aircraft operates under the air operator certificate of the lessor.
That AOC point is more important than the branding painted on the aircraft. The ACMI provider is the operating carrier responsible for the regulated flight operation, even when the customer controls the route, sells the seats, and uses its own flight number.
ACMI vs dry lease vs damp lease
| Arrangement | Aircraft | Flight crew | Operating AOC |
|---|---|---|---|
| ACMI / wet lease | Provided by lessor | Provided by lessor | Lessor |
| Dry lease | Provided without crew | Provided by lessee | Lessee |
| Damp lease | Provided by lessor | Flight crew normally supplied by lessor; cabin-crew arrangements vary | Generally treated as wet leasing because the lessor retains operational responsibility |
“Damp lease” is an industry expression rather than a separate category in the EU Air Services Regulation. The European Commission has explained that it falls within wet leasing when the aircraft remains under the lessor’s AOC.
Who is responsible for safety and the flight?
The lessor operates the aircraft under its AOC. An AOC is the approval that permits an operator to conduct specified commercial air transport operations. It also identifies the authority responsible for oversight of that operator.
Wet leasing still requires regulatory approval. Under Article 13 of Regulation (EC) No 1008/2008, lease-in arrangements involving an EU carrier are subject to applicable aviation-safety approval. Extra conditions apply when an EU carrier wet leases an aircraft registered in a third country. EASA guidance also requires authorities to examine the lessor’s AOC, authorised operating areas, airworthiness documentation, and equivalent safety standards where relevant.
Why do airlines use ACMI capacity?
- Seasonal demand: adding capacity for a summer or holiday peak without keeping the aircraft year-round.
- Aircraft shortages: covering grounded aircraft, delivery delays, or maintenance disruption.
- Route launches: testing or opening a route before permanent crews and aircraft are available.
- Cargo peaks: adding lift when freight demand changes quickly.
- Operational resilience: sourcing replacement capacity at shorter notice than a fleet acquisition would allow.
The model buys speed and flexibility. It does not remove operational or financial risk; it reallocates responsibilities between the provider and customer for a defined period.
What does an ACMI flight look like to passengers?
A passenger may book through one airline and fly on an aircraft and crew supplied by another. The booking airline remains the commercial point of contact, while the operating carrier named in the booking information performs the flight. Branding, onboard service, uniforms, and cabin configuration may belong to either party depending on the arrangement.
What does ACMI work mean for pilots?
Pilots work within the provider’s approved operation, procedures, training system, and command structure. They may nevertheless spend long periods at customer bases and operate routes associated with the customer airline.
- Base assignments can change when commercial contracts change.
- Rotational rosters are common, but there is no universal ACMI roster.
- Travel, hotels, positioning days, and per diem can materially change the value of an offer.
- The employer may be the AOC holder, another group company, or an agency; pilots should identify the legal counterparty before signing.
- Contract stability depends partly on the provider’s customer agreements and fleet deployment.
Read the ACMI hiring guide for application steps, the ACMI pilot salary guide for contract comparisons, and the ACMI vs legacy vs low-cost guide for the wider career trade-offs.
Common ACMI misconceptions
ACMI is not only cargo flying
Passenger, leisure, charter, and scheduled airlines also buy ACMI capacity. Cargo is highly visible in this market, but it is only one use case.
The provider does not necessarily own the aircraft
The provider may itself lease the aircraft financially. In an ACMI contract, “Aircraft” describes what the provider supplies to the customer, not necessarily the asset’s ultimate ownership.
ACMI does not guarantee higher pilot pay
Some packages can be attractive, especially when travel and accommodation are covered. Others transfer tax, pension, insurance, or unpaid-gap risk to the pilot. The complete contract matters more than a quoted monthly number.
How to evaluate an ACMI operator
- Verify the operator and AOC with the relevant national aviation authority.
- Identify the company named as employer or contracting party.
- Check who pays for positioning, hotels, visas, training, medicals, and licence conversion.
- Confirm guaranteed pay, payment dates, currency, and what happens between assignments.
- Read termination, sick-leave, loss-of-licence, and repatriation terms.
- Treat fleet totals and customer announcements as time-sensitive, and verify them at the date of application.
Comments