Air Transport Association Advanced Technology Attachment Actual Time of Arrival Army Technical Architecture Advanced Tactical Aircraft Agrarische Termijnmarkt Amsterdam Allen Telescope Array American Trucking Association Ammonia Tank Assembly Automatic Target Acquisition Automatic Trouble Analysis AT Attachment Auxiliary Ocean Tug American Telemedicine Association atmospheres absolute Aerospace Testing Alliance Airport Traffic Area American Telemarketing Association Analog Terminal Adapter ASTRA Avionics Test Article Abort Timing Assembly Acctual Time Of Arrival air to air Air Transport Association of America Air Transport Auxiliary Airlift Tanker Association alimentary toxic aleukia Alliance for Technology Access American Tinnitus Association