Definition

The fuel level at which an aircraft must return to base or proceed to alternate landing site, lest it become an expensive lawn dart. Crossing bingo means you're playing a very dangerous game of fuel chicken.

Example Usage

Viper 2-1, you're approaching bingo fuel in fifteen minutesโ€”time to wrap up this patrol.

Origin

Aviation term from the 1950s, possibly derived from the game Bingo as a signal that time is up

Fun Fact

Different from 'joker fuel' (the fuel level to abort mission and head home), creating a hierarchy of increasingly urgent fuel-related panic levels.

Source: Military aviation operations terminology

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