an arrangement of two or more airplanes flying together in a group, usually in a predetermined pattern.
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How to use flight formation in a sentence
He consulted ornithologists, and learned that the configuration of parallel lines agrees with the flight-formation of cranes.The Book of the Damned | Charles Fort
British Dictionary definitions for flight formation
two or more aircraft flying together in a set pattern
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012