ACMI Lease

ACMI stands for Aircraft, Crew, Maintenance, and Insurance — the four components bundled together in this type of lease, in which a specialist operator provides a complete, flight-ready aircraft to another airline on a short- or medium-term basis.

What Is an ACMI Lease?

An ACMI lease is effectively synonymous with a wet lease in most commercial contexts. The distinction between the terms is subtle: "wet lease" is the broader commercial term, while "ACMI" specifically enumerates what is included, making it the preferred technical term in industry contracts. When airlines or charter brokers refer to ACMI, they mean the lessee receives a serviceable aircraft with fully qualified crew, an active maintenance program, and hull and liability insurance already in place.

The lessee is responsible for fuel, ground handling, landing fees, navigation charges, and passenger-facing services such as catering and airport staffing. The ACMI provider manages everything that keeps the aircraft legally airworthy and staffed.

How It Works in Practice

A classic ACMI scenario: A Scandinavian leisure carrier wins a new summer contract to operate weekly charters between Oslo and a Mediterranean resort. Rather than recruiting and training new pilots for a single aircraft it needs for 12 weeks, it contracts an ACMI provider. The provider delivers a narrowbody aircraft with its own crew roster, maintenance tracking, and insurance certificate. The lessor's pilots operate the flight; the lessee's ground staff handle passenger check-in and boarding.

ACMI rates are negotiated per block hour. The contract defines minimum monthly guaranteed hours, so the ACMI provider has predictable revenue even in weeks with low utilization. Typical minimum guarantees range from 200 to 400 block hours per month per aircraft.

Qatar Airways, for example, has both utilized ACMI providers during capacity crunches and provided ACMI services on certain routes. Lufthansa's affiliated carriers have also served as de facto ACMI operators for mainline Lufthansa routes during pilot shortages.

Why It Matters

ACMI is the aviation industry's primary mechanism for separating aircraft operations from commercial activities. An airline that knows how to sell tickets and manage yield need not own or crew aircraft; ACMI providers supply that operational layer. This separation has given rise to a dedicated industry of specialist ACMI operators who build fleets and crew pools optimized for quick deployment.

Key Facts and Figures

• Global ACMI market size is estimated at several billion dollars annually.
• Block hour rates for narrowbody ACMI typically range from $5,000 to $12,000 per block hour.
• ACMI contracts commonly run for 3 to 12 months with options to extend.
• Providers must hold a valid AOC in their country of registration; passengers fly under the provider's safety certificate.
• Common ACMI providers: Hi Fly (Portugal), Air Atlanta Icelandic, Titan Airways (UK), SmartLynx (Latvia).

Related Concepts

Wet Lease, Dry Lease, Charter Operation, Capacity Purchase Agreement, Blocked Space Agreement