This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Preparing for or occurring before flight.

v. To check (an aircraft) for airworthiness before flight.

adj. Taking place before the start of a flight

n. An inspection of an aircraft before the start of a flight

"But there aren't that many of us who do that kind of preflight checkout work, and everybody's work pad checked out clean."

postflight    prelaunch    timeof    preoperational    four-point