List of American Aero Squadrons

This is a partial list of original Aero Squadrons organized under the Aviation Section, U.S. Signal Corps before and during World War I.

Squadrons

 * (Note war declared 6-April-1917)
 * In January 1918 a new numbering scheme for aero squadrons was set up. Numbers 1–399 would be for Aero Service Squadrons (AS). 400–599 Aero Construction Squadrons (ACS), 600–799 Aero Supply Squadrons and 800–1099 Aero Repair Squadrons.

1 to 50

 * 1st Aero Squadron 8-December-1913 OB
 * 2d Aero Squadron 1-December-1915
 * 3d Aero Squadron 1-November-1916 School
 * 4th Aero Squadron May 5, 1917 School
 * 5th Aero Squadron May 5, 1917
 * 6th Aero Squadron 13-March-1917
 * 7th Aero Squadron 29-March-1917
 * 8th Aero Squadron 21-June-1917 OB
 * 9th Aero Squadron 14-June-1917 OB
 * 10th Aero Squadron May 31, 1917 repair unit
 * 11th Aero Squadron 26-June-1917 Bomber
 * 12th Aero Squadron 2-June-1917 OB
 * 13th Aero Squadron 14-June-1917 PU
 * 14th Aero Squadron May 9, 1917
 * 15th Aero Squadron May 9, 1917
 * 16th Aero Squadron May 15, 1917
 * 17th Aero Squadron 30-July-1917 PU
 * 18th Aero Squadron 20-August-1917
 * 19th Aero Squadron 14-June-1917
 * 20th Aero Squadron 26-June-1917 Bomber
 * 21st Aero Squadron May 15, 1917
 * 22d Aero Squadron 16-June-1917 OB
 * 23d Aero Squadron 16-June-1917 repair unit
 * 24th Aero Squadron 14-June-1917 OB
 * 25th Aero Squadron 13-June-1917 PU
 * 26th Aero Squadron 1-October-1917
 * 27th Aero Squadron 15-June-1917 PU
 * 28th Aero Squadron 22-June-1917 PU
 * 29th Aero Squadron 10-October-1917
 * 30th Aero Squadron 13-June-1917 repair unit
 * 31st Aero Squadron 26-June-1917
 * 32d Aero Squadron 13-June-1917
 * 33rd Aero Squadron May 17, 1917 training unit?
 * 34th Aero Squadron 11-June-1917
 * 35th Aero Squadron 12-June-1917
 * 36th Aero Squadron 12-June-1917
 * 37th Aero Squadron 13-June-1917
 * 38th Aero Squadron 12-June-1917
 * 39th Aero Squadron 5-June-1917
 * 40th Aero Squadron not activated
 * 41st Aero Squadron 16-June-1917 PU
 * 42d Aero Squadron 13-June-1917
 * 43d Aero Squadron 13-June-1917
 * 44th Aero Squadron 30-June-1917
 * 45th Aero Squadron (I) Redesignated as: 81st Aero Squadron
 * 45th Aero Squadron (II) 12-July-1917 from 2nd Reserve Aero Squadron
 * 46th Aero Squadron not activated
 * 47th Aero Squadron 20-July-1917
 * 48th Aero Squadron 4-August-1917
 * 49th Aero Squadron 6-August-1917 PU
 * 50th Aero Squadron 6-August-1917 OB

51 to 99

 * 51st Aero Squadron- Redesignated as: 463d
 * 52d Aero Squadron- Redesignated as: 464th
 * 53d Aero Squadron- Redesignated as: 465th
 * 54th Aero Squadron- Redesignated as: 466th
 * 55th Aero Squadron- Redesignated as: 467th
 * 56th Aero Squadron- Redesignated as: 468th
 * 57th Aero Squadron- Redesignated as: 469th
 * 58th Aero Squadron- Redesignated as: 470th
 * 59th Aero Squadron- Redesignated as: 471st
 * 60th Aero Squadron- Redesignated as: 472d
 * 61st Aero Squadron- Redesignated as: 473d
 * 62d Aero Squadron- Redesignated as: 474th
 * 63d Aero Squadron- Redesignated as: 475th
 * 64th Aero Squadron- Redesignated as: 476th
 * 65th Aero Squadron- Redesignated as: 477th
 * 66th Aero Squadron- Redesignated as: 478th
 * 67th Aero Squadron- Redesignated as: 479th
 * 68th Aero Squadron- Redesignated as: 480th
 * 69th Aero Squadron- Redesignated as: 481st
 * 70th Aero Squadron- Redesignated as: 482d
 * 71st Aero Squadron- Redesignated as: 483d
 * 72d Aero Squadron- Redesignated as: 484th
 * 73d Aero Squadron- Redesignated as: 485th
 * 74th Aero Squadron- Redesignated as: 486th
 * 75th Aero Squadron- Redesignated as: 487th
 * 76th Aero Squadron- Redesignated as: 488th
 * 77th Aero Squadron- Redesignated as 489th
 * 77th Aero Squadron – Squadron A Barron Fld (this is the predecessor to the current 77th Fighter Squadron)
 * 78th Aero Squadron- Redesignated as: 490th
 * 79th Aero Squadron- Redesignated as: 491st
 * 80th Aero Squadron- Redesignated as: 492d
 * 81st Aero Squadron- Redesignated as: 493d
 * 82d Aero Squadron- Redesignated as: 494th
 * 83d Aero Squadron- Redesignated as: 495th
 * 84th Aero Squadron- Not activated
 * 85th Aero Squadron 17-August-1917 OB
 * 86th Aero Squadron 17-August-1917 repair unit
 * 87th Aero Squadron 18-August-1917
 * 88th Aero Squadron 18-August-1917 OB
 * 89th Aero Squadron 17-August-1917
 * 90th Aero Squadron 20-August-1917 OB
 * 91st Aero Squadron 21-August-1917 OB
 * 92d Aero Squadron 21-August-1917
 * 93d Aero Squadron 19-August-1917 PU
 * 94th Aero Squadron 20-August-1917 PU
 * 95th Aero Squadron 20-August-1917 PU
 * 96th Aero Squadron 20-August-1917 Bomb
 * 97th Aero Squadron 20-August-1917
 * 98th Aero Squadron 20-August-1917
 * 99th Aero Squadron 21-August-1917 OB

100 to 150

 * 100th Aero Squadron 20-August-1917 Bomb
 * 101st Aero Squadron 22-August-1917
 * 102nd Aero Squadron 23-August-1917
 * 103rd Aero Squadron 31-August-1917 PU
 * 104th Aero Squadron 25-August-1917 OB
 * 105th Aero Squadron 27-August-1917 supply
 * 106th Aero Squadron 27-August-1917 Redesignated 800th
 * 107th Aero Squadron 27-August-1917 Redesignated 801st
 * 108th Aero Squadron 27-August-1917 Redesignated 802d
 * 109th Aero Squadron 28-August-1917 Redesignated 803d
 * 110th Aero Squadron
 * 111th Aero Squadron 14-August-1917 Redesignated as: 632nd
 * 112th Aero Squadron 18-August-1917 Redesignated as: 633d
 * 113th Aero Squadron 26-August-1917 Redesignated as: 634th
 * 114th Aero Squadron Redesignated as: 635th missing
 * 115th Aero Squadron Redesignated as: 636th
 * 116th Aero Squadron Redesignated as:637th
 * 117th Aero Squadron Redesignated as:638th
 * 118th Aero Squadron Redesignated as: 639th
 * 119th Aero Squadron 2-September-1917
 * 120th Aero Squadron 20-August-1917
 * 121st Aero Squadron Redesignated as: 640th
 * 122d Aero Squadron Redesignated as: 641st
 * 123d Aero Squadron Redesignated as: 642d
 * 124th Aero Squadron Redesignated as: 643d
 * 125th Aero Squadron Redesignated as: 644th
 * 126th Aero Squadron Redesignated as: 645th
 * 127th Aero Squadron Redesignated as: 646th
 * 128th Aero Squadron Redesignated as: 647th
 * 129th Aero Squadron Redesignated as: 648th
 * 130th Aero Squadron Redesignated as: 649th
 * 131st Aero Squadron Redesignated as: 650th
 * 132d Aero Squadron not activated
 * 133d Aero Squadron not activated
 * 134th Aero Squadron not activated
 * 135th Aero Squadron 1-August-1917 OB
 * 136th Aero Squadron not activated
 * 137th Aero Squadron 9-September-1917
 * 138th Aero Squadron 28-September–1917 PU
 * 139th Aero Squadron 21-September-1917 PU
 * 140th Aero Squadron missing
 * 141st Aero Squadron 8-October-1917 PU
 * 142d Aero Squadron 4-October-1917
 * 143d Aero Squadron not activated
 * 144th Aero Squadron not activated
 * 145th Aero Squadron not activated
 * 146th Aero Squadron not activated-changed to 654th Aero Squadron
 * 147th Aero Squadron 10-November-1917 PU
 * 148th Aero Squadron 11-November-1917 PU
 * 149th Aero Squadron 7-December-1917
 * 150th Aero Squadron not activated

151 to 199

 * 151st Aero Squadron 8-December-1917
 * 152d Aero Squadron 8-December-1917
 * 153d Aero Squadron 8-December-1917
 * 154th Aero Squadron 8-December-1917
 * 155th Aero Squadron 1-December-1917
 * 156th Aero Squadron- missing
 * 157th Aero Squadron 10-December-1917
 * 158th Aero Squadron 10-December-1917
 * 159th Aero Squadron 10-December-1917
 * 160th Aero Squadron not activated
 * 161st Aero Squadron 12-December-1917
 * 162d Aero Squadron 17-December-1917
 * 163d Aero Squadron 18-December-1917
 * 164th Aero Squadron not activated
 * 165th Aero Squadron 26-November-1917
 * 166th Aero Squadron ?-?-1917 OB
 * 167th Aero Squadron missing
 * 168th Aero Squadron 12-December-1917
 * 169th Aero Squadron 15-December-1917
 * 170th Aero Squadron 18-December-1917
 * 171st Aero Squadron 29-November-1917
 * 172d Aero Squadron 10-December-1917 OB
 * 175th Aero Squadron not activated
 * 176th Aero Squadron 19-December-1917
 * 177th Aero Squadron missing
 * 178th to 181 not activated
 * 182d Aero Squadron 22-November-1917
 * 183d Aero Squadron redesignated 1st Airpark 3-December-1917
 * 184th Aero Squadron 2-December-1917
 * 185th Aero Squadron 11-November-1917
 * 186th Aero Squadron 16-November-1917
 * 187th Aero Squadron missing
 * 188th Aero Squadron 9-November-1917
 * 189 to 198th not activated
 * 199th Aero Squadron 27-November-1917

200 to 299

 * 200th Aero Squadron- Redesignated 496th
 * 201st Aero Squadron- Redesignated 497th
 * 202d Aero Squadron- Redesignated 498th
 * 203d Aero Squadron- Redesignated 499th
 * 204th Aero Squadron- Redesignated 500th
 * 213th Aero Squadron 1-December-1917
 * 214th Aero Squadron
 * 215th Aero Squadron
 * 216th Aero Squadron
 * 217th Aero Squadron
 * 218th Aero Squadron redesignated 4th Airpark 10-January-1918
 * 222d Aero Squadron 18-December-1917
 * 223d Aero Squadron 10-January-1918
 * 227th Aero Squadron 12-January-1918
 * 228th Aero Squadron
 * 229th Aero Squadron Redesignated as: 655th
 * 230th Aero Squadron Redesignated as: 656th
 * 231st Aero Squadron Redesignated as: 657th
 * 232d Aero Squadron Redesignated as: 658th
 * 233d Aero Squadron Redesignated as: 659th
 * 234th Aero Squadron Redesignated as: 660th
 * 235th Aero Squadron Redesignated as: 661st
 * 236th Aero Squadron Redesignated as: 662nd
 * 237th Aero Squadron Redesignated as: 663rd
 * 238th Aero Squadron Redesignated as: 664th
 * 239th Aero Squadron Redesignated as: 665th
 * 240th Aero Squadron Redesignated as: 666th
 * 241st Aero Squadron Redesignated as: 667th
 * 242d Aero Squadron Redesignated as: 668th
 * 243d Aero Squadron Redesignated as: 804th
 * 244th Aero Squadron Redesignated as: 805th
 * 245st Aero Squadron Redesignated as: 806th
 * 247th Aero Squadron 1-February-1918
 * 248th Aero Squadron 1-February-1918
 * 255th Aero Squadron Redesignated 3rd Airpark 6-February-1918
 * 257th Aero Squadron 14-February-1918
 * 258th Aero Squadron 9-February-1918
 * 259th Aero Squadron 14-February-1918
 * 260th Aero Squadron 14-February-1918
 * 261st Aero Squadron 7-February-1918
 * 264th Aero Squadron 30-January-1918
 * 266th Aero Squadron 19-February-1918
 * 267th Aero Squadron 20-February-1918
 * 269th Aero Squadron 5-February-1918
 * 278th Aero Squadron 14-February-1918
 * 279th Areo Squadron Redesignated 5th Airpark 10-February-1918
 * 280th Aero Squadron not activated
 * 281st Aero Squadron 8-February-1918
 * 282d Aero Squadron missing
 * 283d to 305th not activated

300 to 399

 * 309th Aero Squadron 7-July-1917
 * 334th Aero Squadron 8-September-1917 Redesignated 652d
 * 335th Aero Squadron missing
 * 336th Aero Squadron missing
 * 337th Aero Squadron missing
 * 338th Aero Squadron 22-December-1917 Redesignated 672d
 * 341st Aero Squadron 9-July-1917
 * 350th Aero Squadron 12-January-1918
 * 351st Aero Squadron 24-January-1918
 * 353d Aero Squadron 14-January-1918
 * 354th Aero Squadron 28-January-1918 OB
 * 369th Aero Squadron 31-December-1917
 * 370th Aero Squadron 15-January-1918
 * 371st Aero Squadron missing
 * 372d Aero Squadron 17-January-1918
 * 373d Aero Squadron 19-January-1918
 * 374th Aero Squadron 24-January-1918
 * 375th Aero Squadron 20-January-1918
 * 376th Aero Squadron 20-January-1918

400 to 599

 * 400th Aero Construction Squadron May 23, 1917
 * 401 to 461 not activated
 * 462d Aero Construction Squadron 4-August-1917
 * 463d Aero Construction Squadron 23-August-1917
 * 464th Aero Construction Squadron 7-August-1917
 * 465th Aero Construction Squadron 26-August-1917
 * 466th Aero Construction Squadron 28-August-1917
 * 467th Aero Construction Squadron 25-August-1917
 * 468th Aero Construction Squadron 8-August-1917
 * 469th Aero Construction Squadron 8-August-1917
 * 470th Aero Construction Squadron 9-August-1917
 * 471st Aero Construction Squadron missing
 * 472d Aero Construction Squadron missing
 * 473d Aero Construction Squadron missing
 * 474th Aero Construction Squadron 11-August-1917
 * 475th Aero Construction Squadron missing
 * 476th Aero Construction Squadron missing
 * 477th Aero Construction Squadron 11-August-1917
 * 478th Aero Construction Squadron missing
 * 479th Aero Construction Squadron missing
 * 480th Aero Construction Squadron 12-August-1917
 * 481st Aero Construction Squadron 12-August-1917
 * 482d Aero Construction Squadron 1-August-1917
 * 483d Aero Construction Squadron 13-August-1917
 * 484th Aero Construction Squadron 15-August-1917
 * 485th Aero Construction Squadron 13-August-1917
 * 486th Aero Construction Squadron 13-August-1917
 * 487th Aero Construction Squadron 14-August-1917
 * 488th Aero Construction Squadron 14-August-1917
 * 489th Aero Construction Squadron 13-August-1917
 * 490th Aero Construction Squadron 14-August-1917
 * 491st Aero Construction Squadron 15-August-1917
 * 492d Aero Construction Squadron 15-August-1917
 * 493d Aero Construction Squadron 17-August-1917
 * 494th Aero Construction Squadron 17-August-1917
 * 495th Aero Construction Squadron 17-August-1917
 * 496th Aero Construction Squadron 11-October-1917
 * 497th Aero Construction Squadron 11-October-1917
 * 498th Aero Construction Squadron 15-December-1917
 * 499th Aero Construction Squadron 19-December-1917
 * 500th Aero Construction Squadron 19-December-1917

600 to 799

 * 632d Aero Supply Squadron
 * 633d Aero Supply Squadron
 * 634th Aero Supply Squadron
 * 635th Aero Supply Squadron
 * 636th Aero Supply Squadron 28-August-1917
 * 637th Aero Supply Squadron 28-August-1917
 * 638th Aero Supply Squadron 30-August-1917 PU?
 * 639th Aero Supply Squadron 1-September-1917
 * 640th Aero Supply Squadron 1-September-1917
 * 641st Aero Supply Squadron 2-September-1917
 * 642d Aero Supply Squadron 3-September-1917
 * 643d Aero Supply Squadron 3-September-1917
 * 644th Aero Supply Squadron 2-September-1917
 * 645th Aero Supply Squadron 3-September-1917
 * 646th Aero Supply Squadron 3-September-1917
 * 647th Aero Supply Squadron not activated
 * 648th Aero Supply Squadron 5-September-1917
 * 649th Aero Supply Squadron 5-September-1917
 * 650th Aero Supply Squadron 5-September-1917
 * 655th Aero Supply Squadron 21-December-1917
 * 656th Aero Supply Squadron 22-December-1917
 * 657th Aero Supply Squadron 19-December-1917
 * 658th Aero Supply Squadron 23-December-1917
 * 659th Aero Supply Squadron 22-December-1917
 * 660th Aero Supply Squadron 19-December-1917
 * 661 to 666 not activated
 * 667th Aero Supply Squadron 23-December-1917
 * 668 to 669 not activated

800 to 1099

 * 800th Aero Repair Squadron 26-August-1917
 * 801st Aero Repair Squadron 26-August-1917
 * 802d Aero Repair Squadron 27-August-1917
 * 803d Aero Repair Squadron 28-August-1917
 * 804th Aero Repair Squadron not activated
 * 805th Aero Repair Squadron 23-November-1917
 * 806th Aero Repair Squadron ?-November-1917
 * 807th to 819th not activated
 * 820th Aero Repair Squadron January 7, 1918
 * 821st Aero Repair Squadron 1918?
 * 822nd Aero Repair Squadron not activated
 * 823d Aero Repair Squadron missing
 * 824th Aero Repair Squadron missing
 * 825th Aero Repair Squadron 28-January-1918
 * 826th Aero Repair Squadron 1-February-1918
 * 827th Aero Repair Squadron 11-February-1918
 * 828th Aero Repair Squadron 11-February-1918
 * 829th Aero Repair Squadron 11-February-1918
 * 830th Aero Repair Squadron 12-February-1918
 * 831st to 834th missing
 * 835th Aero Repair Squadron 1-February-1918
 * 836th Aero Repair Squadron missing
 * 837th Aero Repair Squadron 1-feb-1918
 * 838th, 839th missing
 * 840th Aero Repair Squadron 4-February-1918
 * 841st Aero Repair Squadron missing
 * 842d to 851 not activated
 * 852d Aero Repair Squadron missing
 * 853d to 874th not activated
 * 875th Aero Repair Squadron 1-July-1918
 * 876th to 1098 not activated

1099 to 1111

 * 1099th Aero Replacement Squadron May 20, 1918
 * 1100th Aero Replacement Squadron not activated
 * 1101st Aero Replacement Squadron 13-April-1918
 * 1102d Aero Replacement Squadron May 12, 1918
 * 1103d Aero Replacement Squadron May 9, 1918
 * 1104th Aero Replacement Squadron May 22, 1918
 * 1105th Aero Replacement Squadron May 26, 1918
 * 1106th Aero Replacement Squadron 1-June-1918
 * 1107th Aero Replacement Squadron 27-July-1918
 * 1108th Aero Replacement Squadron 30-March-1918
 * 1109th Aero Replacement Squadron- not activated
 * 1110th Aero Replacement Squadron missing
 * 1111th Aero Replacement Squadron 5-October-1918