America entered World War I without aircraft capable of fighting the German Luftwaffe. In the United States, however, US fliers had a capable training aircraft in the Thomas-Morse S4C Scout. Nicknamed the “Tommy” the United States Army trained many of its pilots in S4C Scouts before shipping the fliers to Europe, where they would be placed in French aircraft usually Nieuports. Scouts can still be seen flying in many older movies about World War I, and many of this type still found uses into the 1930s. This plane can be found at: United States Air Force Museum in Dayton, Ohio.
For more information on this airplane see: Thomas-Morse S4C Scout