Load Factor

Imagine an airline operating a flight with 180 seats, and 162 of those seats actually sell, that flight has a load factor of 90%, a simple ratio that turns out to be one of the single most important numbers in the entire airline business, because an airline's core costs, fuel, crew, aircraft ownership, are largely fixed regardless of how many seats actually sell, meaning load factor determines almost directly whether a given flight is profitable or not.

This matters so much specifically because airline economics are brutally sensitive to this ratio, once a flight covers its fixed costs at a certain load factor, often somewhere in the 70-75% range depending on the route and fare mix, every additional seat sold beyond that point contributes almost entirely to profit, while every empty seat below that threshold represents pure lost revenue on a cost the airline already committed to paying regardless.

This is exactly why low-cost carriers like IndiGo obsess over load factor as intensely as they do, their entire business model depends on consistently filling planes close to capacity through aggressive pricing and route selection, a load factor advantage of even a few percentage points over a competitor, sustained across thousands of flights a year, compounds into a genuinely significant profitability gap.

Load factor is also why airlines adjust fares dynamically as a flight date approaches, if bookings are running behind where the airline needs them to hit its target load factor, prices often drop to stimulate demand, if a flight is already tracking toward a high load factor, prices tend to rise instead, exactly the kind of real-time supply-and-demand pricing that makes airline ticket prices feel so unpredictable to the average traveller, even though it's actually following a fairly systematic underlying logic.