The bilateral agreements concerning international air travel defined by the Chicago Convention in 1944, covering such topics as overflight, stopovers, and passenger carriage.

(idiomatic) Not yet resolved, finished, answered, decided or certain.

Used other than figuratively or idiomatically: see up, in, the, air.

(ultimate frisbee) A throw at a downward angle with an upward attitude causing the disc to descend during the beginning of the flight and then rise.

An equal mixture of nitrous oxide and oxygen, used as a mild analgesic and anaesthetic, particularly during childbirth, for dental procedures, and in emergency medicine.

The capital city of Argentina. / The largest and most populous province in Argentina, part of the Pampas region.

(idiomatic, broadcasting) An unintended interruption in a broadcast during which nothing is transmitted: a silent period on radio or a silent period with no picture on television.

A branch of the military mainly devoted to air warfare, as opposed to (land) army and navy. / A unit in the U.S. Air Force larger than a division but smaller than a command.

A rifle that propels a pellet or other projectile by using compressed gas, rather than an explosion of gunpowder or other means.

An imaginary guitar that a listener to (usually rock) music pretends to play.