Boeing 747-400

William E. Boeing produced his fist two B&Ws (a single- engine seaplane) in 1916 and the following year, the U.S. Navy ordered 50 of Boeings next model (the two- seat model C trainer)to serve in in World War I. Boeing continued to make airplanes, both commercial and military, producing such famous models as the Pan American "Clipper" flying boat and the "Stratoliner" (first pressurized cabin). In World War II, Boeing became an integral part of the allied effort by building the B-17 and B29 bombers. In the post-war era, Boeing continued making military aircraft such as the B-47 and B-52 bombers but also recognized the huge market for commercial jet aircraft and thus developed the 707 which would help revolutionize air travel. Today, with jets in operation for carriers in 120 different countries, Boeing is best known as the world's largest manufacturer of commercial aircraft. The Boeing company is headquartered in Seattle, Washington and employs approximately 120,000 people. In recent years, Boeing has consistently been one of the top three exporters in the United States.