The Canadian Air Transport Security Authority was officially formed April 1, 2002, following the terrorist attacks on September 11, 2001 in the United States. After September 11, 2001, the Government of Canada took responsibility for airport screening which, until then, was the responsibility of the airlines as per direction from Transport Canada. The Canadian Air Transport Security Authority Act (Budget Implementation Act, 2001) provides additional security requirements as prescribed under the "Aeronautics Act".