Fuel is large but not the only expense
Jet fuel is highly visible and can be one of the biggest variable costs, especially on long sectors. Hedging, local fuel prices and aircraft efficiency all influence the final figure.
Crew cost includes more than time in the air
Pilot and cabin-crew pay, allowances, positioning, hotels and training contribute to labor expense. Complex schedules can create costs that are not obvious from the block time alone.
Aircraft ownership continues while the plane sits
Lease payments or depreciation and financing costs exist whether an aircraft flies or not. High utilization helps spread those fixed costs across more revenue-generating hours.
Maintenance accumulates with hours and cycles
Engines, landing gear and other components consume life with use. Airlines often account for maintenance on an hourly or cycle basis even when the actual shop visit occurs months later.
Airports and air-navigation systems charge for access
Landing fees, passenger charges, parking, ground handling and en-route navigation can be substantial. Busy or premium airports can materially change route economics.
Unit cost is more useful than one headline number
Airlines often compare cost per available seat kilometer or mile because it normalizes aircraft size and distance. A flight can be expensive in absolute terms yet efficient on a per-seat basis.
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