ETYM From Fly.
1. Capable of or engaged in flight.
2. Designed for swift movement or action.
3. Done swiftly in or as if in the air; used e.g. of a racing start in which runners are already in motion as they cross the starting line.
4. Hurried and brief; SYN. quick, fast.
5. Of or relating to passage through the air especially aviation.
1. Travel by air
2. The operation of an aircraft or spacecraft