[1] Applications Technology Satellite - Testsatellitenreihe der NASA 1966-1974 {Weltraumfahrt}

[2] Astronomical Time Switch

[3] Administrative Terminal System

[4] Apple Terminal Services

[5] Aarhus Tekniske Skole - Aarhus Technical College (Dänemark, http://www.ats.dk/)

[6] Automated Test System

[7] Artesia, NM, USA -internationale Fughafen-Kennung.