a squadron of airplanes operating together, especially any of several squadrons of famous World War I aviators.
a carnival troupe, or the like, offering exhibitions of stunt flying at fairs, circuses, etc.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for flying circus
an exhibition of aircraft aerobatics
the aircraft and men who take part in such exhibitions
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