Scheduled air transport is the the part of civil aviation that involves Airlines operating passenger or cargo flights on fixed schedules. Typical examples of passenger airlines include American Airlines, Royal Brunei, British Airways, Lufthansa, and Singapore Airlines; examples of passenger and cargo airlines include Cargolux and Delta Airlines.
Scheduled air transport started after World War I using mostly ex-military aircraft for the purpose of transporting people and goods for profit. A profitable cargo was air mail, which was the means by which governments subsidized air travel. Between October 1929, when the Graf Zeppelin inaugurated the first scheduled transatlantic service, and May 6,1937, when the Hindenburg burned, airships were a major mode of long-distance air travel. After World War II the introduction of Jetliners allowed large numbers of people to be quickly transported.