ACMI vs Engine Lease: Airline Capacity Recovery Guide 2026
A 72-hour framework for airlines deciding between spare-engine leasing, ACMI, dry lease and schedule protection when aircraft are grounded or deliveries slip.
The 72-Hour Airline Capacity Recovery Playbook
A grounded aircraft does not automatically mean an airline needs another aircraft. Sometimes it needs an engine. Sometimes it needs ACMI capacity. Sometimes the cheapest decision is to protect the network and wait.
The expensive mistake is solving the wrong constraint.
2 October 2026 · ACMI World
When an aircraft goes AOG, an incoming delivery slips or an engine shop visit runs beyond plan, airline management normally has several possible responses: lease a spare engine, source ACMI capacity, take another aircraft on dry lease, extend an existing lease, swap capacity internally or reduce the schedule.
These are not interchangeable solutions. The correct response starts with identifying exactly what has become unavailable.
First Question: What Exactly Is Grounded?
The aircraft is serviceable, but an engine is unavailable
Start with spare-engine availability. Replacing an entire aircraft with ACMI capacity can be commercially excessive if the airframe, crews, approvals and network infrastructure are already available.
The aircraft itself will be unavailable for an uncertain period
ACMI becomes more relevant. The airline is purchasing operational lift: aircraft, crew, maintenance and insurance from another operator instead of repairing only one missing component.
A new aircraft delivery has moved by months or years
Compare ACMI against dry lease and extension of existing aircraft. A short bridge may justify ACMI. A multi-year capacity requirement can justify the additional work required to induct a dry-leased aircraft.
The disruption lasts only a few rotations
Do not automatically source a new aircraft. Schedule swaps, spare utilisation, retiming or targeted charter capacity may protect more margin than entering a longer capacity contract.
The Capacity-Recovery Matrix
| Problem | First Structure to Test | Why | Main Risk |
|---|---|---|---|
| Single engine unavailable | Spare-engine lease | Keeps the existing aircraft and operating infrastructure productive. | Engine configuration, records, LLP status and lease extension risk. |
| Aircraft AOG for several months | ACMI wet lease | Operational aircraft can be introduced without creating a complete new operating platform. | Rate, minimum utilisation, positioning and regulatory approval. |
| OEM delivery delayed 12–36 months | Dry lease / lease extension | May provide better economics for a sufficiently long requirement. | Induction cost, crews, maintenance condition and return exposure. |
| Short peak-period shortage | ACMI / charter | Buys temporary lift without adding permanent fleet. | Peak-season availability and premium pricing. |
| Demand weaker than forecast | Schedule protection | The most profitable replacement aircraft may be no aircraft at all. | Slots, connectivity and commercial commitments. |
Do Not Compare Lease Rates Before Comparing Lost Revenue
The relevant number is not simply the monthly engine lease or ACMI block-hour rate. It is the cost of the solution versus the contribution that disappears when the aircraft remains grounded.
A comparatively expensive spare engine can still be the rational choice if it restores a high-utilisation aircraft to revenue service immediately. Equally, expensive ACMI capacity can destroy margin if it is deployed on weak routes simply to preserve the published schedule.
Why Engines Have Become So Valuable
IATA's current supply-chain analysis illustrates how unusual the market has become. It says the value represented by two full-life engines can now be approximately 80% of the value of a new aircraft, compared with roughly 20%–30% two decades ago.
IATA also says PW1100G lease rates have more than doubled relative to 2019, while LEAP-1A and LEAP-1B lease rates have increased by more than 50%.
That changes fleet economics. Engine availability can determine whether the airline has usable capacity at all.
Read ACMI World's detailed guide to spare-engine leasing in 2026 and our engine-lessor shortlist .
The First 72 Hours
Before approaching the market, the airline should produce one internal requirement sheet. Without it, operators, lessors and engine providers are being asked to price an undefined problem.
When ACMI Is the Better Answer
ACMI becomes particularly powerful when the airline needs a complete operating solution rather than another asset.
If the requirement includes aircraft, crews, maintenance capability and insurance—and it must enter service quickly—the higher apparent unit cost of ACMI may be justified by deployment speed and lower induction burden.
That is why ACMI continues to be used for engine groundings, delayed deliveries, seasonal peaks, new routes and temporary fleet gaps.
For commercial assumptions, minimum utilisation and cost allocation, see ACMI World's guide to ACMI lease pricing .
When a Dry Lease Is Better
The longer the disruption becomes, the more seriously an airline should test dry-lease economics.
If the airline already has crews, engineering capability, approvals and sufficient time to induct another aircraft, paying another operator to provide the full ACMI package indefinitely may not be efficient.
This is particularly relevant where an OEM delivery has slipped by a year or more rather than several weeks.
ACMI World covers the structural differences in its ACMI and dry-lease aircraft guide .
The Question Procurement Should Ask
Do not ask only: “What aircraft is available?”
Ask: “What is the smallest intervention that restores the required revenue-producing capacity?”
Sometimes that is a PW1500G or PW1100G spare engine. Sometimes it is an A320 on ACMI for six months. Sometimes it is a three-year dry lease. Sometimes it is cancelling the least profitable frequencies and protecting the rest of the network.
Asset availability, operating approvals, technical condition, contract duration and lost contribution must all be priced together.
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