Canada commenced the operation after the U.S. Federal Aviation Administration ( FAA ) , implementing Security Control of Air Traffic and Air Navigation Aids ( SCATANA ) , grounded all aircraft across the United States , an unprecedented action .
Canada began the operation after the U.S. Federal Aviation Administration ( FAA ) ( carried out by Security Control of Air Traffic and Air Navigation Aids ( SCATANA ) ) had grounded all the aircraft across the United States .