Answer:
The use of airplanes in WWI changed the way war was fought. Originally the WWI planes were used for reconnaissance. They discovered planes could be used as bombers and fighters. They developed into machines that could attack from the air with the fifty millimeter Browning automatic gun. They could sink ships, destroy military installations, destroy planes and cities. Eventually the missiles were developed and aerial attacks could be precise. Now we can use jets and missiles to attack targets miles away without the airplane coming close to the target. Once jet engines were developed air transportation for commercial use went from propeller planes that could only carry a limited amount of passengers or cargo to jet planes that could carry hundreds of passengers and tons of cargo. Air travel changed the world to being a world where countries could be global in its endeavors and travel was only a matter of hours versus days or weeks by ship. An exceptional contribution to progress for a plane with two or three wings.