As the countries began to recognize the usefulness of aircraft over the battlefield, they started investing heavily in the development of new and better machines. In this gallery "Planes" we have 106 free PNG images with transparent background.“Aviation technology underwent a period of explosive growth during World War I. In this gallery you can download free PNG images: Planes PNG images free download, plane PNG photo The Boeing 707, the first widely successful commercial jet, was in commercial service for more than 50 years, from 1958 to at least 2013. The first jet airliner, the de Havilland Comet, was introduced in 1952. The first jet aircraft was the German Heinkel He 178 in 1939. Airplanes had a presence in all the major battles of World War II. Following its limited use in World War I, aircraft technology continued to develop. Between 18, the German pioneer of human aviation Otto Lilienthal also studied heavier-than-air flight. They built on the works of George Cayley dating from 1799, when he set forth the concept of the modern airplane (and later built and flew models and successful passenger-carrying gliders). The Wright brothers invented and flew the first airplane in 1903, recognized as "the first sustained and controlled heavier-than-air powered flight". Most airplanes are flown by a pilot on board the aircraft, but some are designed to be remotely or computer-controlled. Commercial aviation is a massive industry involving the flying of tens of thousands of passengers daily on airliners. The broad spectrum of uses for airplanes includes recreation, transportation of goods and people, military, and research. Airplanes come in a variety of sizes, shapes, and wing configurations. An airplane or aeroplane (informally plane) is a powered, fixed-wing aircraft that is propelled forward by thrust from a jet engine or propeller.
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