---

R-1	 Engineering Division VCP-1 1921 - Verville racer
R-1	 Platt-LePage 1941
R-2	 Curtiss 1915
R-2	 Thomas-Morse (MB-6) racer 1921
R-2	 Kellett (YG-1) 1941
R-3	 Curtiss (R-2) 1916
R-3	 Engineering Division 1922 - Sperry racer
R-3	 Kellett (YG-1) 1941
R-4	 Curtiss (R-2) 1918
R-4	 Loening racer 1922
R-4	 Vought-Sikorsky VS-316 Hoverfly 1942
R-5	 Thomas-Morse racer 1922 
R-5	 Vought-Sikorsky VS-372 1944 
R-6	 Curtiss 1918
R-6L	 Curtiss 1918
R-6	 Curtiss (CR) racer 1922
R-6	 Vought-Sikorsky (R-4) Hoverfly II 1944
R-7	 Curtiss (R-6) 1922
R-7	 Engineering Division racer 1944 - cancelled
R-7	 Sikorsky XR-6 - never built
R-8	 Curtiss (R2C-1) 1923
R-8	 Kellett 1943
R-9	 Curtiss (R-6L) 1918
R-9	 Firestone 45 1944
R-10	 Kellett (R-8) 1945
R-11	 Rotorcraft 1944
R-11	 Hughes (F-11) 1948
R-12	 Bell 48 1944 - to H-12
R-12	 Republic (F-12) Rainbow 1948
R-13	 Bell 47 1947 - to H-13
R-14	 Firestone 1946 - cancelled
R-15	 Northrop (F-15) Reporter 1948
R-16	 Vertol Transporter 1946 - to H-16
R-16	 Boeing (RB-52) 1948
R2C 	 Curtiss (R-8) racer 1923
R2D	 Douglas DC-2 1934
R2K	 Fairchild 1936
R2O	 Lockheed (UC-36) Electra 1940
R2Q	 Fairchild (J2Q) 1950
R2Y	 Consolidated (RY) 1945
R3C-1	 Curtiss (F3C) racer 1925
R3C-2	 Curtiss (R3C-1) 1925
R3D	 Douglas DC-5 1939
R3O 	 Lockheed (C-37) Electra 1937
R3Q	 Stinson (RQ) Reliant 1935
R3Y	 Convair (P5Y) Tradewind 1952
R4C 	 Curtiss (C-30) Condor 1934
R4D	 Douglas (C-47/-53) Dakota/Skytrain 1938
R4D-8	 Douglas (C-47F) Super DC-3 1952
R4O	 Lockheed 1941
R4Q	 Fairchild (C-119) Flying Boxcar 1947
R4Y	 Convair (C-131) Samaritan 1957
R5C 	 Curtiss (C-46) Commando 1942
R5D 	 Douglas (C-54) Skymaster 1942
R5O	 Lockheed (C-56/-60) Lodestar 1942
R6D	 Douglas (C-118) Liftmaster 1950
R6O	 Lockheed Constitution 1945
R6V	 Lockheed (R6O) Constitution 1945
R7O 	 Lockheed (C-69) Constellation 1952 - to R7V
R7V	 Lockheed (C-121C) Warning Star 1954
R8V	 Lockheed (C-130) Hercules 1958 - to HC-/SC-130
RA-2	 North American (AJ) 1962
RA-3	 Douglas (A3D-2P) 1962
RA-5	 North American (A3J) 1962
RA-7	 Vought Corsair II - cancelled
RA	 Atlantic (TA) 1931
RAH-66	 Boeing-Sikorsky (H-66) 1991
RB 	 Budd (C-93) Conestoga 1930
RB-17	 Boeing (F-9) 1948 
RB-26	 Douglas 1948
RB-29	 Boeing 1948
RB-35	 Northrop 1947
RB-36	 Convair 1950
RB-45	 North American 1949
RB-47	 Boeing 1955
RB-49	 Northrop 1950
RB-50	 Boeing 1954
RB-52	 Boeing (R-16) 1955
RB-54	 Boeing 1948 - proposed
RB-57	 Martin-GD Canberra 1954
RB-69	 Lockheed (P2V-7U) Neptune 1954
RC 	 Curtiss Kingbird 1931
RC-12	 Beech Huron 1983
RC-45	 Beech Navigator 1948
RC-47	 Douglas Dakota 1950
RC-54	 Douglas Skymaster 1962
RC-121	 Lockheed (R7V) Warning Star 1955
RC-130	 Lockheed Hercules 1968
RC-131	 Convair Samaritan 1956
RC-135 	 Boeing ELINT 1964
RD 	 Douglas (OA-4) Dolphin 1931
RE	 Bellanca (JE) Skyrocket 1932
RF-4	 Lockheed Lightning 1943
RF-4	 McDonnell Phantom II 1962
RF-5E	 Northrop Tigereye 1968
RF-8	 Vought (F8U-1P) Photo Crusader 1962
RF-9J	 Grumman F9F-8P) Cougar 1962
RF-14	 Grumman Tomcat 1981 - proposed
RF-16	 Genl Dynamics Fighting Falcon 1990
RF-18	 McDonnell Douglas Hornet 1988 - proposed
RF-51	 North American Mustang 1948
RF-61	 Northrop Reporter 1948
RF-80	 Lockheed Shooting Star 1948
RF-84F	 Republic (F-96) Thunderflash 1963
RF-86	 North American Sabre 1957
RF-87	 Curtiss Blackhawk 1948
RF-100	 North American Super Sabre 1954
RF-101	 McDonnell Voodoo 1954
RF-104	 Lockheed Starfighter 1975
RF-105	 Republic Thunderchief 1960
RF-110	 McDonnell Phantom II 1962 - to RF-4C
RG-8	 Schweizer 1989
RH-3	 Sikorsky Sea King 1962
RH-46	 Boeing Sea Knight 1962 
RH-53	 Sikorsky Stallion 1972
RK	 Kinner 1936
RL-23D	 Beech Seminole 1959 - to RU-8D
RL-26	 Aero Commander 1960 - to RU-9
RM 	 Martin (C-3) 1952
RO	 Lockheed (C-23) Altair 1931
ROE	 Hiller rotorcycle 1958
RON	 Gyrodyne rotorcycle 1958
RP-3	 Lockheed Orion c.1970
RP-35A	 Seversky Guardsman 1943
RP-39	 Bell Airacobra 1940
RP-43	 Republic Lancer 1943
RP-63	 Bell 1945
RQ	 Fairchild (JQ) 1948
RQ 	 Stinson (C-81/AT-19) Reliant 1935
RR	 Ford (JR) 1931
RS 	 Sikorsky (PS) 1930
RS-2C	 Grumman (S2F-2P) Tracker 1962
RS-70	 North American (B-70) Valkyrie 1963
RS-71	 Lockheed (SR-71) Blackbird 1964
RT	 Northrop 1935
RT-33	 Lockheed T-Bird 1954
RU-1A	 De Havilland Otter c.1970
RU-9	 Aero (RL-26D) Commander 1962
RU-21	 Beech (C-12L) Ute/Huron
RU-8D	 Beech (RL-23D) Seminole
RV-1	 Grumman Mohawk c.1963
RY	 Consolidated (C-87) 1943

S-1	 Curtiss 1916
S-1	 Loening 1922
S-1	 Cox-Klemin 1923
S-1	 Bell Skyrocket 1946 - to X-1
S-2	 Curtiss 1916
S-2	 Bell 1946 - to X-2
S-2	 Grumman (S2F) Tracker 1962
S-3	 Curtiss triplane 1916
S-3	 Douglas Stiletto 1946 - to X-3
S-3	 Lockheed Viking 1972
S-4	 Northrop Bantam 1947 - to X-4
S-5	 Bell 1947 - to X-5
S2C	 Curtiss A-10 Shrike 1932
S2F	 Grumman (S-2) Tracker 1952
S2L	 Loening 1931
S2U	 Vought 1952 - to WU-1 but not completed
S3C	 Curtiss (F8C-8) Helldiver 1931
S4C	 Curtiss (F12C) Helldiver 1933
SA-10	 Consolidated PBY-6 1945
SA-16	 Grumman JR2F Albatross 1947 - to HU-16A
SB-17	 Boeing c.1940 
SB-29	 Boeing 1948
SB2A	 Brewster (SBA) Buccaneer 1939
SB2C	 Curtiss A-25 Helldiver 1940
SB2D	 Douglas Destroyer 1945
SB2U	 Vought Vindicator 1936
SB3C	 Curtiss A-40 1942
SB3U	 Vought (SBU) 1936
SBA	 Brewster 1936
SBC	 Curtiss (S4C) Helldiver 1934
SBD	 Douglas A-24 Dauntless 1940
SBF	 Fairchild (SB2C) Helldiver 1943
SBG	 Great Lakes 1936
SBN	 N A F (SBA) 1938
SBT	 Northrop 1936
SBU	 Vought (F3U) 1933
SBW	 Curtiss-Canada (SB2C) 1943
SC	 Curtiss Seahawk 1943
SC	 Martin (CS) 1925
SC-130	 Lockheed Hercules 1958
SC-47	 Douglas Dakota/Skytrain c.1940
SC-54	 Douglas Skymaster c.1940
SDW	 N A F-Dayton-Wright (DT) 1925
SE	 Bellanca 1932
SF	 Grumman (FF) 1932
SG	 Great Lakes 1931
SH-2	 Kaman Seasprite/LAMPS I 1963
SH-3	 Sikorsky (HSS-2) Sea King 1962
SH-34	 Sikorsky (HSS-1) Seabat 1962
SH-60	 Sikorsky Sea Hawk 1974
SH-60F	 Sikorsky Ocean Hawk 1985
SL	 Loening 1931
SN2J	 North American (SNJ) 1945
SNB	 Beech (TC-45/RC-45) Navigator 1941
SNC	 Curtiss 1941
SNJ	 North American (SNJ) Texan 1942
SNV	 Vultee (BT-13/15) Valiant 1940
SO2C	 Curtiss 1935
SO2E	 Edo 1945
SO2U	 Vought 1939
SO3C	 Curtiss Seamew 1939
SOC	 Sikorsky Seagull 1935
SOE	 Bellanca 1936
SOK	 Fairchild 1935
SON	 N A F (SOC) Seagull 1937
SOR	 Ryan (SOC) Seagull 1941
SP-2	 Lockheed (P2V-7) Neptune 1962
SP-5	 Martin (P5M-1S) Marlin 1962
SR-71	 Lockheed Blackbird 1964
SS	 Sikorsky 1931
ST	 Stout 1922
SU	 Vought (O3U) Corsair 1931
SV-22	 Bell-Boeing Osprey 1989 - proposed

T-1	 Martin (GMP) 1919
T-1	 Lockheed (T2V) SeaStar 1962
T-1	 Beech 400T Jayhawk 1992
T-2	 Fokker F.IV 1923
T-2 	 Rockwell (T2J) Buckeye 1958
T-3	 L-W-F 1920 - cancelled
T-3      Slingsby Firefly (UK) 1992
T-4	 not assigned
T-5	 not assigned
T-6 	 North American (AT-6/SNJ) Texan 1948
T-7	 Beech (AT-7) Navigator 1948
T-8 to -10 not assigned
T-11	 Beech (AT-11) Kansan 1948
T-12 to -16 not assigned
T-17	 Boeing (PT-17) Kaydet 1948
T-18	 not assigned
T-19	 Fairchild (PT-19) 1948
T-20 to -27 not assigned
T-28	 North American Trojan 1948
T-28D	 North American Nomad 1962
T-29	 Convair 240 Flying Classroom 1948
T-30	 Douglas (BT-30) 1948 - not built
T-31 	 Fairchild (NQ) 1949 - not built
T-32	 Condor (B-2) Curtiss 1934
T-32	 Consolidated 1949 - cancelled
T-33	 Lockheed (TF-80C) 1948
T-33	 Boeing Skyfox 
T-34	 Beech 35 Mentor 1953
T-35	 Temco Buckaroo 1950
T-36	 Beech 1950 - cancelled
T-37	 Cessna 318 1954
T-38 	 Northrop N-156 Talon 1958
T-39 	 Rockwell (T3J) Sabreliner 1962
T-40	 Lockheed (C-140) JetStar
T-41	 Cessna Mescalero 1965
T-42	 Beech Cochise 1966
T-43	 Boeing 737 1971
T-44	 Beech (U-21) 1977
T-45	 McDonnell Douglas-BAe Goshawk 1988
T-46	 Fairchild-Republic Eaglet - cancelled
T-47	 Cessna Citation S/II 1977
T-48	 Cessna (T-37) 1984
T2D	 Douglas (TN) 1927
T2J	 Rockwell (T-2) Buckeye 1958
T2M	 Martin (SC) 1925
T2N	 N A F 1930
T2V 	 Lockheed (TV-2) SeaStar 1956
T3D	 Douglas 1930
T3J	 Rockwell (T-39) Sabreliner 1958
T3M	 Martin (SC) 1926
T4M	 Martin (T3M) 1927
T5M	 Martin 1928
T6M 	 Martin 1929
TA	 Atlantic (C-2) 1928
TA-1	 Elias 1921
TA-2	 Huff-Daland 1921
TA-3	 Dayton-Wright Chummy 1921
TA-3	 Douglas (A3D-2T) Skywarrior 1962
TA-4	 Engineering Division 1922 - not built
TA-4	 Douglas (A4D) Skyhawk 1965
TA-5	 Dayton-Wright (TA-3) 1922
TA-6	 Huff-Daland (TA-2) 1923
TA-7	 Vought Corsair II 1972
TAF-9J	 Grumman (AF-9) Cougar 1962
TAV-8	 McDonnell Douglas-BAe Harrier II 1969
TB	 Boeing 1921
TB2D	 Douglas 1943 
TBD	 Douglas Devastator 1935
TB2F	 Grumman (F7F) 1944
TB3F	 Grumman Guardian 1945
TBF	 Grumman Avenger 1941
TBG	 Great Lakes (B2G) 1935
TBM	 Eastern-GMC (TBF) Devastator 1942
TBU	 Vought Sea Wolf 1941
TBY	 Consolidated Sea Wolf (TBU) 1943
TB-17	 Boeing 1945
TB-24	 Consolidated c.1940
TB-25	 North American (AT-24) 1948
TB-26	 Martin (AT-23) 1948
TB-32	 Convair c.1942
TB-50	 Boeing 1953
TB-58	 Convair 1960
TC-4	 Gulfstream Academe 1967
TC-45	 Beech (SNB-5) Navigator 1953
TC-46	 Curtiss c.1940
TC-47	 Douglas 1948
TC-54	 Douglas 1955
TC-117	 Douglas Super DC-3 1962
TC-131	 Convair Samaritan 1956
TD2C	 Culver (PQ-14) drone 1942
TD2D	 McDonnell Katydid drone 1942
TD2N	 Martin-N A F (TDN) Gorgon 1943
TD2R	 Interstate 1943 drone
TD3C	 Culver (PQ-15) drone 1943
TD3D	 Frankfort (OQ-16) drone 1943
TD3N	 Martin-N A F (TDN) Gorgon 1943
TD3R	 Interstate (BQ-6) drone 1943
TD4C	 Culver 1943 drone - to UC
TD4D	 Radioplane (OQ-16) drone 1943
TDC 	 Culver (PQ-8) drone 1942
TDD	 Radioplane drone 1942
TDN	 N A F flying bomb 1942
TDR	 Interstate (TDN) drone 1943
TE	 Edo (OSE) 1948
TE-2	 Lockheed Hawkeye 1962
TF	 N A F 1920
TF	 Grumman (C-1) Trader 1955 - to C-1
TF-4	 McDonnell Douglas (F4H) 1973
TF-8	 Vought (F8U-1T) 1962
TF-9J	 Grumman (F9F-8T) 1962
TF-10	 Douglas (F3D-2T) 1962
TF-15	 McDonnell Douglas 1970
TF-16	 General Dynamics 1977
TF-18A	 McDonnell Douglas 1976
TF-80	 Lockheed 1948 - to T-33
TF-86	 North American 1953
TF-101	 McDonnell 1962
TF-102	 Convair 1951
TF-104	 Lockheed 1961
TG	 N A F 1924
TG	 Great Lakes (T4M) 1929
TG-1	 Cinema-Frankfort 1941
TG-2 	 Schweizer (TG-2/LNS) 1941
TG-3	 Schweizer 2-12A 1942
TG-4 	 Laister-Kaufmann LK-1000S 1942
TG-5 	 Aeronca (L-3/LNR) 1942
TG-6 	 Taylorcraft (L-2/LNT) 1942
TG-7	 Orlick 1942
TG-7	 Schleicher 1989
TG-8 	 Piper (L-4/LNP) 1942
TG-9	 Briegleb BG-6 1942
TG-9	 Schweizer 1989
TG-10	 Wichita 1942
TG-11	 Schemp 1942
TG-12	 Bowlus 1942
TG-13	 Briegleb BG-8 1942
TG-14	 Steiglemaie S-24 1942
TG-15	 Franklin PS-2 1942
TG-16	 A B C 1942
TG-17	 Franklin 1942
TG-18	 Midwest MU-1 1942 
TG-19	 Schweyer 1942
TG-20	 Laister-Kaufmann 1942
TG-21	 Notre Dame ND-1 1942
TG-22	 Melrose 1942
TG-23	 Harper-Corcoran 1942
TG-24	 Bowlus-DuPont 1942
TG-25	 Plover BT-2 1942
TG-26	 Universal 1942
TG-27	 Grunau 1942
TG-28	 Haller Hawk 1942
TG-29	 Volmer Jensen VJ-10 1942
TG-30	 Smith Bluebird 1942
TG-31	 Aero Industries G-2 1942
TG-32	 Pratt-Read (LNE-1) 1943
TG-33	 Aeronca (TG-5) 1944
TH-1E/L	 Bell (HU-1A/UH-1E) Seawolf 1962
TH-1S	 Bell (AH-1) Huey/Cobra 1970
TH-13	 Bell (HTL) Sioux 1946
TH-55	 Hughes Osage 1956
TH-57	 Bell Sea Ranger 1968
TJ	 North American - cancelled
TL-19	 Cessna 1956
TM	 Martin (MT) 1923
TN	 N A F 1927
TO	 Lockheed (F-80C/T-33) T-Bird 1950
TO-1D	 Cessna (TL-19D) Bird Dog 1962
TP-1	 Engineering Division 1922 - to XCO-5
TP-2F	 Lockheed (P2V-6) 1962
TP-5	 Martin Marlin (P5M-1T) 1962
TP-38	 Lockheed 1940 
TP-40	 Curtiss 1944
TP-51	 North American 1943
TP-80	 Lockheed 1948 - to T-33
TR	 N A F (TS) racer 1923
TR-1	 Lockheed (U-2R) 1981
TR-3	 Northrop?
TRF-51	 North American (F-6D) 1948
TSF	 Grumman 1943 - proposed
TS	 N A F-Curtiss 1922
TS-2	 Grumman (S2F-1T) Tracker 1962
TT	 Temco Pinto 1960
TU-6	 De Havilland Beaver 1950
TU-16	 GrummanAlbatross  (UF-1T) 1948
TV	 Lockheed (TO-1) T-Bird 1945
TW-1	 Engineering Division 1920
TW-2	 Cox-Klemin 1922
TW-3	 Dayton-Wright (TA-5) 1923
TW-4	 Fokker 1923
TW-5 	 Huff-Daland (HN-1) 1923

U-1	 Caspar 1922
U-1	 De Havilland DHC-3 (UC) Otter 1955 - to TR-1
U-3	 Cessna 310/320 1962
U-4	 Aero (L-26) Commander 1962
U-5	 Helio Twin Courier 1964
U-6	 De Havilland DHC-2 Beaver 1962
U-7	 Piper (L-21) Seneca 1962
U-8	 Beech (L-23D/F) Seminole 1962
U-9	 Aero Commander (L-26) 1962
U-10	 Helio (L-28) Super Courier 1962
U-11	 Piper (UO) Aztec 1962
U-16	 Grumman (SA-16) Albatross 1962
U-17	 Cessna 185 Skywagon 1962
U-18 	 North American (L-17) Navion 1962
U-19	 Stinson (L-5) 1962
U-20	 Cessna (LC-126) 1962
U-21	 Beech (U-8F) Huron/Ute 1966
U-22	 Beech 35 Pave Eagle 1960
U-23	 Fairchild-Hiller 1971
U-24	 Helio Stallion 1971
U-25	 Beech (C-12) Huron 1962
U-25	 Dassault Guardian 1982
U-26	 Cessna 172/185 Turbo Stationair 19??
U-27	 Cessna Caravan I 1987
UA-1	 Douglas (AD-5) Skywarrior 1962 
UB-26	 Douglas (JD) Invader 1962
UC	 Culver (TD4C) drone 1946
UC 	 De Havilland (U-1) Otter 1960
UC-12D	 Beech Huron 1975
UC-27	 Fokker 1965 
UC-36	 Lockheed Electra 1943
UC-37	 Lockheed Electra 1943
UC-40	 Lockheed Electra 1943
UC-43	 Beech Traveler 1943
UC-45	 Beech Expeditor 1962
UC-61	 Fairchild Forwarder 1943
UC-64	 Noorduyn Norseman 1943
UC-67	 Douglas Dragon 1943
UC-70	 Howard Nightingale 1943
UC-71	 Spartan Executive 1943
UC-72	 Waco 1943
UC-77    Cessna DC-6 1942 (also as C-77)
UC-78	 Cessna Bobcat 1943
UC-81	 Stinson Reliant 1943
UC-83	 Piper Coupe 1943
UC-94    Cessna C-165 1942 (also as C-94)
UC-95	 Taylorcraft Grasshopper 1943
UC-96	 Fairchild 1943
UC-100	 Northrop Gamma 1943
UC-102A  Rearwin 8135 1942
UC-101	 Lockheed Vega 1943
UC-123B	 Fairchild Provider c.1960
UC-880	 Convair 1980
UF	 Vought (UO) 1922
UF	 Grumman (PF/JR2F) Albatross 1948
UH-1	 Bell Huey/Iroquois 1962 - from HU-1
UH-1M	 Bell INFANT 1968
UH-1N	 Bell Twin Huey c.1980
UH-2 	 Kaman Seasprite 1962
UH-3	 Sikorsky Sea King - presidential
UH-13	 Bell (HUL) Sioux c.1950
UH-19	 Sikorsky (HO4S) Chickasaw c.1950
UH-34	 Sikorsky (HUS) Seahorse 1962
UH-43	 Kaman Huskie 1962 - to HUK
UH-46	 Boeing-Vertol Sea Knight 1964
UH-60	 Sikorsky (UH-60L/M) Black Hawk 1975
UH-60A	 Sikorsky (HH-60) Credible Hawk 1980
UH-60A	 Sikorsky CINC Hawk 1988
UH-61	 Boeing-Vertol 1977
UO	 Vought (VE-7/-9) 1922 - to UF
UO	 Piper (U-11) Aztec 1960
US-2	 Grumman Tracker 1962 - to S2F-2U
US-3	 Lockheed Viking 1976
USD-9	 Engineering Div (DH-9) 1917
UV	 Lockheed Hercules (C-130B) 1954 - to LC-130F
UV	 Lockheed (C-140) - cancelled
UV-18	 De Havilland (V-18) Twin Otter 1976
UV-20	 Pilatus (V-20) Chiricahua 1979
UV-23	 Skytrader (V-23) Scout 1989

V-1	 McDonnell 1954 - to H-35/L-25
V-1	 Grumman (OF) Mohawk 1960 - to AO-1
V-2	 Sikorsky 1955
V-2	 De Havilland (AC-1) Caribou STOL 1960
V-3	 Bell (H-33)
V-4	 Lockheed (VZ-10) Hummingbird VTOL 1962
V-5	 Ryan (VZ-11) Vertifan VTOL 1962
V-6	 Hawker-Siddeley (VZ-12) STOVL 1962
V-7	 De Havilland (AC-2) Buffalo STOL 1960 - to C-8
V-8	 Ryan 1960
V-8	 McDonnell Douglas-BAe Harrier STOVL 1971
V-9	 Hughes 1970
V-10	 Rockwell Bronco/J-STARS 1965
V-11	 MSU Marvel STOL 1969
V-12	 Rockwell VATOL 1972
V-15	 Boeing Osprey 1977
V-16	 BAe 1973 - proposed
V-18	 De Havilland Twin Otter STOL 1976
V-20	 Pilatus PC-6 Chiricahua STOL 1979
V-22	 Bell-Boeing Osprey 1989
V-23	 Skytrader Scout STOL 1989
VA-3	 Douglas Skywarrior 19??
VB-26	 Douglas 1950
VC-3	 Martin 1962
VC-4	 Gulfstream I 1953
VC-6	 Beech King Air 90 1977
VC-7A	 De Havilland Caribou c.1980
VC-9C	 McDonnell Douglas 1970
VC-11	 Gulfstream II 1961
VC-12	 Beech Huron c.1970
VC-25	 Boeing 'Air Force One' 1990
VC-45J	 Beech Expeditor 1960
VC-47H/J Douglas (R4D-5/6Z) c.1950
VC-54	 Douglas (R5D) 1950 - to R5D-1Z
VC-97	 Boeing 1954
VC-117	 Douglas (R4D-8) Super DC-3 1962
VC-118	 Douglas DC-6 'Independance' 1945
VC-121	 Lockheed 'Columbine' 1942
VC-121	 Lockheed 'Bataan' 1942
VC-121	 Lockheed 'Dewdrop' 1942
VC-121	 Constellation Lockheed 1948
VC-123	 Fairchild Provider 1952 - proposed
VC-131H	 Convair 1955 - to R4Y-1Z
VC-135	 Boeing 1965
VC-137	 Boeing 707 1959
VC-137C	 Boeing 'Air Force One' 1959
VC-140	 Lockheed JetStar 1960
VE-7	 Vought 1921
VE-9	 Vought (VE-7) 1922
VH-1	 Bell Huey c.1970
VH-3	 Sikorsky Sea King 1962
VH-34	 Sikorsky Choctaw 1962
VH-60	 Sikorsky 1988
VP-3	 Lockheed Orion c.1970
VZ-1	 Hiller (HO-1E) Pawnee 1955
VZ-2	 Vertol 76
VZ-3	 Ryan 72 Vertiplane 1958
VZ-4	 Doak 16 Convertiplane 1959
VZ-5	 Fairchild M224-1 1959
VZ-6	 Chrysler 1959
VZ-7	 Curtiss-Wright 1958
VZ-8	 Piasecki 59K Airgeep/Seageep 1959
VZ-9	 Avro Avrocar 1961
VZ-10	 Lockheed Hummingbird 1960 - to V-4
VZ-11	 Ryan Vertifan 1960 - to V-5
VZ-12	 Hawker-Siddeley Kestrel 1960 - to V-6

W2F 	 Lockheed (E-2) Hawkeye 1960
WB-29	 Boeing 1945
WB-50	 Boeing 1954
WB-57	 Martin-GD Canberra 1956
WB-66	 Douglas 1957
WC-130B	 Lockheed Hercules 1962
WC-135	 Boeing 1965
WF 	 Grumman (E-1) Tracer 1954
WP	 Wright 1924
WP-3D	 Lockheed Orion 1970
WT-33	 Lockheed c.1948
WU	 Vought 1955 - from S2U-1W, but not completed
WU-2	 Lockheed
WV 	 Lockheed (C-69/-121) Warning Star 1950

X-1	 Bell (S-1) Skyrocket 1948
X-2	 Bell (S-2) 1948
X-3	 Douglas (S-3) Stiletto 1948
X-4	 Northrop (S-4) Bantam 1948
X-5	 Bell (S-5) 1948
X-6	 Convair (B-36H) Crusader nuclear 1955
X-7	 Lockheed ramjet 1951
X-8	 Aerojet Aerobee rocket 1947
X-9 	 Bell Shrike GAM 1959
X-10	 North American SM64 1955
X-11	 Convair Atlas A 1957
X-12	 Convair Atlas B/C/D 1958
X-13	 Ryan Vertijet 1955
X-14	 Bell VTOL 1956
X-15	 North American 1959
X-16	 Bell - cancelled
X-17	 Lockheed 1956 - rocket
X-18	 Hiller (C-122) 1959
X-19	 Curtiss-Wright VTOL 1963
X-20	 Boeing Dyna-Soar 1965
X-21	 Douglas (WB-66) 1963
X-22	 Bell VTOL 1965
X-23	 Martin Prime 1966
X-24A	 Martin 1969
X-24B	 Martin (X-24A) 1973
X-25	 Bensen Gyro-glider 1678
X-26	 Lockheed (QT-2) Q-Star 1968
X-27	 Lockheed Lancer 1971
X-28	 Pereira Osprey I 1970
X-29	 Grumman FSW 1984
X-30	 Rockwell NASP 1989
X-31	 Rockwell-MDD EFM 1987
X-32	 Boeing JSF 1998
X-33	 Lockheed-Martin 1996
X-34     Orbital Sciences cancelled
X-35     Lockheed-Martin JSF
X-36	 McDonnell Douglas 1994
X-37     NASA 2002
X-38	 Scaled Composites-Rutan 1996
X-39     USAF, reserved
X-40	 Boeing 
X-41     USAF
X-42     USAF
X-43     NASA 2000
X-44     Lockheed cancelled (?)
X-45     Boeing 2000
X-46     Boeing USN X-45 2000
X-47A	 Northrop-Grumman
X-48A	 NASA-Langley
X-49	 unassigned
X-50A	 Boeing CRV
XS	 Cox-Klemin 1927 

Z-1	 Goodyear (ZPG) airship 1962
Z-1	 Hiller Pawnee flying platform
Z-2	 Vertol c.1960 
Z-2	 Airship 1989
Z-3	 Ryan Vertiplane VTOL c.1960
Z-4	 Doak Convertiplane VTOL
Z-5	 Fairchild VTOL c.1960
Z-6	 Chrysler VTOL c.1960
Z-7	 Curtiss-Wright VTOL c.1960
Z-8	 Piasecki Airgeep/Seageep VTOL 1959
Z-9	 Avro flying saucer c.1960
Z-10	 Lockheed (V-4) Hummingbird 1962
Z-11	 Ryan VTOL c.1960
Z-12	 Hawker-Sidddeley Kestrel VTOL c.1960
ZMC-2	 Detroit Aircraft Metalclad 1929 - LTA
ZPG	 Goodyear 1954 - USN LTA, to ZPN
ZPN	 Goodyear (ZPG) 1950
ZR	 N A F 19?? - USN LTA
ZRS	 Goodyear 1933 - USN LTA