stackup

The definition of a stackup is when airplanes circle around at different heights while waiting to land.

(noun)

An example of a stackup is what happens at an airport when a landing strip must be closed.

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See stackup in Webster's New World College Dictionary

noun

an arrangement of circling aircraft at various altitudes, each awaiting its turn to land

See stackup in American Heritage Dictionary 4

noun
A deployment of aircraft circling an airport at designated altitudes while awaiting instructions to land.
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