ASC: American Satellite Corporation
ASCA: Advanced Satellite for Cosmology and Astrophysics
ASCO: Arab Satellite Communications Organization
ASCO: Arab Space Communications Organization
ASCP: Attitude Set Control Panel
ASCP: Attitude Set/Control Panel
ASCS: Attitude Stabilization and Control System
ASE: Advanced Space Engine
ASE: Aerospace Support Equipment
ASGPD: Attitude Set and Gimbal Position Display
ASI: Agenzia Spaziale Italiana
ASI: Augmented Spark Igniter
ASI: Augmented Spark Indicator
ASI: Augmented System Ignition
ASPOC: Active Spacecraft Potential Control
ASPP: Atmospheric and Space Plasma Physics
ASPRv: Astrophysics and Space Physics Reviews
ASRM: Abort Solid Rocket Motor
ASRM: Advanced Solid Rocket Motor
ASRS: Automated Shuttle Requirement System
ASSA: Astronomical Society of South Africa
ASSESS: Airborne Science Shuttle Experiments System Simulation
ASSU: Annual Scientific Supplement to Urania
ASTD: Advanced Space Technology Division
ASTER: Advanced Spaceborne Thermal Emission and Reflection
ASTG: Aerospace Test Group
AstHe: Astronomical Herald
AstL: Astronomy Letters
ASTP: Apollo-Soyuz Test Project
AstQ: Astronomy Quarterly
ASTRA: Advanced Star Tracker
ASTRA: Astrophysics and Space Sciences Transactions
ASTRO: Ascent Trajectory Optimization
ATAL: Alternate Transoceanic Abort Landing
ATCA: Attitude Translation Control Assembly
ATDRS: Advanced Tracking and Data Relay Satellite
ATel: Astronomer's Telegram
ATG: AEROSPACE TEST GROUP
ATO: Abort To Orbit
ATS: Advanced Technology Satellite