The Air Commerce Act of 1926 created an Aeronautic Branch of the United States Department of Commerce. Its functions included testing and licensing of pilots, certification of aircraft and investigation of accidents. In 1934, the Aeronautics Branch was renamed the Bureau of Air Commerce, to reflect the growing importance of commercial flying. It was subsequently divided into two authorities: the Civil Aeronautics Administration (CAA), concerned with air traffic control, and the Civil Aeronautics Board (CAB), concerned with safety regulations and accident investigation. Under the Federal Aviation Act of 1958, the CAA's powers were transferred to a new independent body, the Federal Aviation Administration (FAA). In the same year, the National Aeronautics and Space Administration (NASA) was created after the Soviet Union’s launch of the first artificial satellite. The accident investigation powers of the CAB were transferred to the new National Transportation Safety Board in 1967, at the same time that the United States Department of Transportation was created. In response to the attacks of September 11, 2001, the government launched the Transportation Security Administration with broad powers to protect air travel and other transportation modes against criminal activity. National Advisory Committee for Aeronautics and airmail European enthusiasm for air power was sparked by an arms race and then by the outbreak of World War I in 1914. During the following year, the United States Congress took a step toward revitalizing American aviation by establishing the National Advisory Committee for Aeronautics (NACA), an organization dedicated to the science of flight. Upon entering World War I in 1917, the United States government mobilized the nation's economy, with results that included an expansion of the small aviation manufacturing industry. Before the end of the conflict, Congress voted funds for an innovative postal program that would serve as a model for commercial air operations. With initial help from the U.S. Army, the Post Office in 1918 initiated an intercity airmail route. The subsequent achievements of the Air Mail Service included the establishment of a transcontinental route and the development of airway lighting. In 1925, the Airmail Act of 1925 authorized the Post Office to contract with private airlines to transport mail. The Airmail Act created American commercial aviation and several of today's airlines were formed to carry airmail in the late 1920s (including Trans World Airlines, Northwest Airlines, and United Airlines). Air Commerce Act Aviation in the United States was not regulated during the