Annual Training access tandem Advanced Technology Air Traffic Assistive Technology acceptance trials Azores Time acceptance trial Atlantic Time Appalachian Trail asynchronous transmission Acceptance tag acceptance test Access and Terminals adenine-thymine Advanced treatment ampere-turn Annual Tour Anti Terrorism Ash Trap Atmosphere Attention Automatic Transmission Auxiliary Telescope Averaging Time Access Tandems Access Terminal Access Time achilles tendon Action Time Active Terminator adipose-tissue After Tax Air Temperature Air Transmit Air Transport Alaskan Time Alert Time Aliveness Test Alternative Technology