Wiktionary
air travel
n. Journeying through the sky, usually in an aeroplane.
WordNet
Wikipedia
Air travel
Air travel is a form of travel in vehicles such as helicopters, hot air balloons, blimps, gliders, hang gliding, parachuting, airplanes or anything else that can sustain flight. Use of air travel has greatly increased in recent decades - worldwide it doubled between the mid-1980s and the year 2000.