(of airspace) In which aircraft are forbidden to fly. / (of people) Who are forbidden to board an aircraft.

Alternative spelling of on the fly

plural of fly (a type of carriage) / plural of fly (butterfly stroke)

(zoology) Any insect of the order Diptera; characterized by having two wings (except for some wingless species), also called true flies.

(slang, dated) Quick-witted, alert, mentally sharp. / (slang) Well dressed, smart in appearance; in style, cool. / (slang) Beautiful; displaying physical beauty.

(countable, aviation) An act of flight. / (uncountable, aerodynamics) The action or process of sustained motion through the air.

present participle of fly

(rural, Scotland, Northern England) A wing.

(obsolete) The action of flying; flight. / An act of flying. / (baseball) A fly ball. / (American football) Short for fly route. / A piece of canvas that covers the opening at the front of a tent.

That flies or can fly. / Brief or hurried. / Capable of speed / (nautical, of a sail) Not secured by yards. / (nautical, of a vessel) Capable of foiling.