What Is ACMI? Definition & Meaning in Aviation
ACMI stands for Aircraft, Crew, Maintenance and Insurance: a type of lease in which the lessor provides all four.
In plain language
ACMI is the usual form of a wet lease. The customer airline pays per block hour and handles commercial matters such as ticket sales, fuel and airport charges.
Example
A carrier can use ACMI capacity to fly extra seasonal services without buying aircraft.
Why it matters
ACMI is a common way for airlines to add flexibility in peak seasons. If you see a flight “operated by” another company, an ACMI or wet-lease arrangement may be behind it.