Fly

True flies are insects of the order Diptera (from the Greek di = two, and ptera = wings). The most obvious distinction from other orders of insects is that a typical fly possesses a pair of flight wings on the mesothorax and a pair of halteres, derived from the hind wings, on the metathorax. (Some species of flies are exceptional in that they are secondarily flightless.) The only other order of insects bearing two true, functional wings plus any form of halteres are the Strepsiptera, and in contrast to the flies, the Strepsiptera bear their halteres on the mesothorax and their flight wings on the metathorax.

A fly is any species of insect of the order Diptera; to fly is a verb referring to flight, the process of flying.

Fly! is a flight simulator for PC and Apple Macintosh computers developed by Terminal Reality and published by Gathering of Developers. It includes simulation of air traffic control features as well as aircraft's on-board systems, and was acclaimed for its highly detailed fully working interactive cockpits. Featured aircraft were exclusively fixed-wing light to medium aircraft. An enhanced version, Fly! 2K, and add-on, Wilco's 737 for Fly!, were released in 2000. A sequel, Fly! II, was released in 2001.