อัตราการบรรทุก (Load Factor) (Load Factor)

What Is Load Factor?

In commercial aviation, load factor (also called passenger load factor or seat load factor) is the percentage of available seat-kilometers (ASKs) occupied by paying passengers, expressed as revenue passenger-kilometers (RPKs) divided by available seat-kilometers. It measures how efficiently an airline fills its aircraft with paying customers. A 100% load factor means every seat is sold; an 80% load factor means one in five seats is empty. For freight operations, the equivalent metric is weight load factor or volume load factor, measuring how much of the aircraft's cargo capacity generates revenue. Load factor is the most-watched commercial KPI in airline management and a primary determinant of profitability.

How It Is Measured

Load factor is calculated as: Load Factor (%) = RPK ÷ ASK × 100, where RPK equals the number of revenue passengers multiplied by distance flown in kilometers, and ASK equals the number of available seats multiplied by the same distance. This metric is reported monthly by airlines and consolidated globally by IATA. The break-even load factor — the load factor at which ticket revenue exactly covers operating costs — is the critical commercial threshold. Airlines typically need load factors of 75–85% to break even, depending on yield (average revenue per passenger-km) and unit costs. Yield management systems dynamically price seats to simultaneously maximize load factor and revenue per seat.

Typical Values by Airline Type

Ryanair consistently achieves load factors above 93%, a record sustained through aggressive ancillary revenue strategies and yield management. The global average load factor crossed 80% for the first time in 2016 and has trended higher since.

Why It Matters

Load factor is the lever that converts aircraft capacity into airline profit. Because most airline costs are fixed per flight (fuel burn varies only modestly with passenger count; crew, maintenance, and airport fees do not change with occupancy), filling an additional seat costs almost nothing but generates significant incremental revenue. This makes the marginal economics of airlines extreme: the difference between 80% and 90% load factor often means the difference between a loss-making and a profitable quarter. Low-cost carriers built their business models around driving load factor to maximum, using transparent ancillary unbundling to keep base fares low enough to stimulate demand while generating revenue from bags, seats, and services.