keep a slot warm
 v. phr.— «An airline is flying an empty passenger jet between Heathrow and Cardiff on a daily basis—just so that it can hold on to its lucrative slots at the London airport.…The flights reveal the lengths to which airlines will go to hang on to runway slots. A slot is the right to use a runway for a take-off or a landing at a given time of the day. The practice is known in the airline industry as “keeping slots warm.”» —“Heathrow’s ‘ghost’ flights” in London, England The Australian (Sydney, Australia) Mar. 12, 2007. (source: Double-Tongued Dictionary)

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