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Most of the major countries of the world developed commercial air transportation in varying degrees, with the U.S. gradually gaining ascendancy. On the foundations of the U.S. air-transport industry were built the military-transport commands that played a decisive role in winning World War II.
Largest of all international airlines in operation when World War II began was Pan American Airways, which, with its subsidiaries and affiliated companies, served 47 countries and colonies on 82,000 route miles, linking all continents and spanning most oceans.
The demands of World War II greatly accelerated the further development of aircraft. Important advances were achieved in the development of planes for bombing and combat and for the transportation of parachute troops and of tanks and other heavy equipment. Aircraft became a decisive factor in warfare.
Small aircraft production expanded rapidly. Under the Civilian Pilot Training program of the Civil Aeronautics Administration, private operators expanded their facilities and gave training to thousands of students, who subsequently became the backbone of the army, navy, and marine-air arms. Types of aircraft designed for personal use found extensive military use throughout the world. Large contracts for light planes were awarded by the U.S. Army and Navy in 1941.
During 1941 American military aircraft were in action on all fronts. The number of persons employed in the aviation industry totaled 450,000, compared to about 193,000 employed before World War II. About 3,375,000 passengers, about 1 million more than in 1940, were carried by 18 U.S. airlines. Mail and express loads increased by about 30 percent.
Toward the end of the war, airplane production attained an all-time high, air warfare increased in intensity and extent, and domestic airlines established new passenger- and cargo-carrying records. In the U.S., the number of planes produced in 1944 totaled 97,694, with an average weight of approximately 4770 kg (about 10,500 lb). An outstanding development in the same year was the appearance in air combat of German jet-engined and rocket-propelled fighter planes.




