A
AABNCP (Advanced Airborne National Command Postn a.k.a. "Nightwatch")
- Boeing 747-200 > E-4A > E-4B
AAFSS (Advanced Aerial Fire Support System)
- Bell D261
- Bell D262
- Boeing Vertol BV-147
- Canadair CL-84A
- Convair Model 49
- Curtiss-Wright Model 90
- Aerospatiale SA-330
- Lockheed CL-840 (Model 187) > YAH-56A Cheyenne
AAH (Advanced Attack Helicopter)
- Bell Model 409
- Boeing Vertol BV-235
- Hughes Model 77 > YAH-64A > Mc Donnell Douglas AH-64A Apache
- Lockheed CL-1700
- Sikorsky S-71
AARV (Advanced Aerial Reconnaissance Vehicle)
AAS (Armed Aerial Scout) (formerly ASH)
- Boeing
- Eurocopter
- Bell
- Sikorsky S-97 Raider
AAW (Active Aeroelastic Wing)
ABC (Advancing Blade Concept)
ABL (Air Borne Laser)
- Boeing 747-4G4F > (YFC-36A) = YAL-1A
ACAP (Advanced Composite Airframe Program)
ACCA (Advanced Composite Cargo Aircraft)
ACLS (Air Cushion Landing System)
- De Havilland Canada DHC-5 > XC-8A
ADCA
AFTI (Advanced Fighter Technology Integration)
- Boeing F-111 MAWS
- Fairchild
- General Dynamics F-16AFTI
- Grumman HiMAT
- Lockheed
- McDonnell Douglas F-15SMTD
- McDonnell Douglas Model/M.B.B. 265
- Rockwell HiMAT
- Ling-Temco-Vought
A/F-X (Attack/Fighter, Experimental) (formerly AX)
- Boeing/Lockheed/General Dynamics AFX-653
- Grumman F-14 variant
- McDonnell Douglas/Vought
AHIP (Army Helicopter Improvement Program)
- Bell 406CS Aeroscout > OH-58D Kiowa Warrior
- McDonnell Douglas 500
AJACS (Advanced Joint Air Combat System)
- Boeing
- Lockheed Martin 'Speed Agile'
- Northrop Grumman
AMC-X
- Boeing PETA
- Lockheed Martin MEDUSA (Multi-Role Delivery & Utility Support Aircraft) > 'Speed Agile'
AMPSS (Advanced Manned Precision Strike System)
- Boeing
- General Dynamics (Convair)
- North American Rockwell
AMR (Advanced Maneuvering Re-entry)
AMSA (Advanced Manned Strategic Aircraft)
- Boeing B-2707-200
- General Dynamics (Convair)
- Lockheed
- North American Rockwell D436 > D458 > D481 > B-1A (Excalibur)
AMST (Advanced Medium STOL Transport)
- Bell
- Boeing 953 > YC-14A
- McDonnell Douglas D-915? > YC-15A
- General Dynamics (Convair)
- Lockheed/North American Rockwell LG-203X
ARH (Armed Reconnaissance Helicopter)
- Bell Model 445 > ARH-70 Arapaho
ARTI
ASH (Armed Scout Helicopter) (see AAS)
ASSET (Aerothermoelastic Structural Systems Environmental Tests)
AST
ATB (Advanced Tactical Bomber)
- Lockheed 'Senior Peg' > Lockheed/Rockwell
- Northrop N-14 'Senior Ice' > Northrop/Boeing/LTV B-2A Spirit
ATF (Advanced Tactical Fighter)
- Lockheed/Boeing > YF-22A Rapier > F-22A Raptor
- Northrop/McDonnell Douglas > YF-23A Black Widow
ATRH (Advanced Tandem Rotor Helicopter)
ATT (Advanced Theater Transport)
- McDonnell Douglas (Boeing) D3132-187 "Super Frog"
- Lockheed Martin
AVS (Advanced Vertical Strike-Fighter)
- Boeing-EWR 360
- Fairchild-Republic
- EWR/Fairchild-Republic > A-400
AWACS (Airborne Warning and Control System)
- Boeing 707-320B > EC-137D = E-3A Sentry
- Boeing 747
- Douglas DC-8-62/-63
- Lockheed L-300
A-X (Attack Experimental)
- Boeing Vertol
- Cessna
- Fairchild-Hiller FH-129 > Fairchild-Republic YA-10A Thunderbolt II
- General Dynamics (Convair)
- Grumman
- Lockheed L-1400
- McDonnell
- Northrop "Turbo-Pusher"-like type
- Northrop > YA-9A
- Ling-Temco-Vought V-502
AX (Attack Experimental) (replaced by A/F-X)
- General Dynamics/McDonnell Douglas/Northrop
- Grumman/Lockheed/Boeing
- Rockwell/Lockheed