A&A: Astronomy and Astrophysics
A&ARv: Astronomy and Astrophysics Review
A&AS: Astronomy and Astrophysics Supplement Series
A&AT: Astronomical and Astrophysical Transactions
A&G: Astronomy and Geophysics
A&L: Approach and Landing
A&P: Attitude and Pointing
AA&AA: Astronomy and Astrophysics Abstracts Heidelberg
AAA: Astronaut-Actuated Abort
AACCS: analytical approach to candidate constellation selection
AACS: Attitude and Antenna Control System
AACS: Attitude and Articulation Control Subsystem
AAFE: Advanced Applications Flight Equipment
AAIR: Advanced Atmospheric sounder and Imaging Radiometer
AAO: Astronaut Activities Office
AAONw: Anglo-Australian Observatory Epping Newsletter
AAOPr: Anglo-Australian Observatory Epping Preprint
AAS: American Astronomical Society Meeting Abstracts
AASPP: Astrononomy and Astrophysics Series
AbbOO: Abbadia Observatory Observations
ABE: Air-Based Electronics
ABM: Apogee Boost Motor
ACA: Altitude Controller Assembly
ACA: Attitude Controller Assembly
ACCESS: Assembly Concept for Construction of Erectable Space Structure
ACDNS: Attitude Control, Determination & Navigation
ACDS: Attitude Control and Determination System
ACE: Attitude Control Electronics
ACEU: AeroControl Electronics Unit
ACiCh: Astronomical Circular
ACMan: Astronomical Contributions from the University of Manchester
ACME: Attitude Control and Maneuvering Electronics
ACP: Astronaut Control Panel
ACPM: Attitude Control Propulsion Motor
ACPS: Attitude Control Propulsion System
ACS: Aft Crew Station
ACS: Altitude Control and Stabilization
ACS: Attitude Control and Stabilization
ACS: Attitude Control System
ACTS: Advanced Communication Technology Satellite