Manufacturers' Codes
 The military assigned two-letter codes to identify the sources of aircraft and certain major components, hence a Liberator with a designation of B-24D-NK would quickly indicate its origin as the Nash-Kelvinator plant. Replacement parts would then preferably come from that source rather than other B-24 builders because of possible variations in tooling and assembly methods. This coding system helped in the bookkeeping and inventory departments, as well. |
| Code | MANUFACTURER |
| AD | Aero Design & Engr Co, Bethany OK |
| AE | Aeronca Aircraft Corp, Middletown OH |
| AG | Air Glider Inc, Akron OH |
| BA | Bell Aircraft Corp, Atlanta GA |
| BB | Babcock Aircraft, Deland FL |
| BC | Bell Aerosystems, Buffalo NY |
| BE | Bell Aircraft Corp, Buffalo NY |
| BF | Bell Aircraft Corp, Fort Worth TX |
| BH | Beech Aircraft Corp, Wichita KS |
| BL | Bellanca Aircraft Corp, New Castle DE |
| BN | Boeing Aircraft Co, Renton WA |
| BO | Boeing Aircraft Co, Seattle WA |
| BR | Briegleb Sailplanes, Beverly Hills CA |
| BS | Bowlus Sailplanes, San Francisco CA |
| BU | Budd Mfg Co, Philadelphia PA |
| BW | Boeing (Stearman) Aircraft Co, Wichita KS |
| CA | Chase Aircraft Co, West Trenton NJ |
| CC | Canadian Commercial Corp, Toronto ONT |
| CE | Cessna Aircraft Co, Wichita KS |
| CF | Consolidated-Vultee Aircraft Corp (Convair), Forth Worth TX |
| CH | Christopher Aircraft Co, St Louis MO |
| CK | Curtiss Airplane Div, Curtiss-Wright Corp, Louisville KY |
| CL | Culver Aircraft Corp, Wichita KS |
| CM | Commonwealth Aircraft, Kansas City KS |
| CN | Chase Aircraft Co, Willow Run MI |
| CO | Consolidated Aircraft Corp, San Diego CA |
| CR | Cornelius Aircraft Co, Dayton OH |
| CS | Curtiss Airplane Div, Curtiss-Wright Corp, St Louis MO |
| CU | Curtiss Airplane Div, Curtiss-Wright Corp, Buffalo NY |
| DC | Douglas Aircraft Co, Chicago IL |
| DE | Douglas Aircraft Co, El Segundo CA |
| DH | De Havilland Aircraft, Toronto ONT |
| DK | Douglas Aircraft Co, Oklahoma City OK |
| DL | Douglas Aircraft Co, Long Beach CA |
| DM | Doman Helicopters, Santa Monica CA |
| DO | Douglas Aircraft Co, Santa Monica CA |
| DT | Douglas Aircraft Co, Tulsa OK |
| FA | Fairchild Engine & Airplane Corp, Hagerstown MD |
| FB | Fairchild Engine and Airplane Corp, Burlington NC |
| FE | Fleet Aviation Ltd, Fort Erie ONT |
| FL | Fleetwings Div, Kaiser Cargo, Bristol PA |
| FO | Ford Motor Co, Willow Run MI |
| FR | Frankfort Sailplane Co, Joliet IL |
| FT | Fletcher Aviation Corp, Pasadena CA |
| GA | G & A Aircraft, Willow Grove PA |
| GC | Fisher Body Div, General Motors, Cleveland OH |
| GE | General Aircraft Corp, Astoria NY |
| GF | Globe Aircraft Corp, Forth Worth TX |
| GK | General Motors, Kansas Ciy KS |
| GM | Fisher Body Div, General Motors, Detroit MI |
| GN | Gibson Refrigerator, Greenville MI |
| GO | Goodyear Aircraft Co, Akron OH |
| GR | Grumman Aircraft Engr Corp, Bethpage NY |
| GT | Grand Central Aircraft Engr Co, Tucson AZ |
| GY | Gyrodyne Co of America, St James NY |
| HE | Helio Aircraft Corp, Norwood MA |
| HI | Higgins Aircraft, New Orleans LA |
| HI | Hiller Helicopter Corp, Palo Alto CA |
| HO | Howard Aircraft Corp, Chicago IL |
| HU | Hughes Aircraft Co, Culver City CA |
| IN | Interstate Aircraft & Engr Corp, El Segundo CA |
| KA | Kaman Helicopter Corp, Windsor Locks CT |
| KE | Kellett Autogyro Corp, Philadelphia PA |
| KM | Kaiser Mfg Corp, Willow Run MI |
| LK | Laister-Kauffman Aircraft Corp, St Louis MO |
| LM | Lockheed-Martin Aircraft Corp, Marietta GA |
| LO | Lockheed Aircraft Corp, Burbank CA |
| MA | Glenn L Martin Co, Baltimore MD |
| MC | McDonnell Aircraft Corp, St Louis MO |
| MD | Martin Co, Baltimore MD |
| MF | Martin Co, Orlando FL |
| MH | McCulloch Motors Corp, Los Angeles CA |
| MM | McDonnell Aircraft Corp, Memphis TN |
| MO | Glenn L Martin Co, Omaha NB |
| NA | North American Aviation, Inglewood CA |
| NC | North American Aviation, Kansas City KS |
| ND | Noorduyn Aviation Co, Montreal QUE |
| NF | North American Aviation, Fresno CA |
| NH | North American Aviation, Columbus OH |
| NI | North American Aviation, Downey CA |
| NK | Nash-Kelvinator Corp, Detroit MI |
| NO | Northrop Aircraft, Hawthorne CA |
| NT | North American Aviation, Dallas TX |
| NW | Nortwestern Aeronautical Corp, St Paul MN |
| PA | Piper Aircraft Corp, Lock Haven PA |
| PH | Piasecki Helicopter Corp, Morton PA |
| PI | Piper Aircraft Corp, Lock Haven PA |
| PL | Platt-Le Page Aircraft Co, Eddystone PA |
| PR | Gould Aeronautical, Pratt Read Co, Deep River CT |
| RA | Republic Aviation Corp, Evansville IN |
| RD | Read-York, Kenosha WI |
| RE | Republic Aviation Corp, Farmingdale NY |
| RI | Ridgefield Mfg Co, Ridgeville NJ |
| RO | Robertson Aircraft, St Louis MO |
| RP | Radioplane Co, Van Nuys CA |
| RY | Ryan Aeronautical Co, San Diego CA |
| SA | Stroukoff Aircraft Corp, West Trenton NJ |
| SE | Seibel Helicopter Co, Wichita KS |
| SI | Sikorsky Aircraft Div, United Aircraft Corp, Stratford CT |
| SL | St Louis Aircraft Corp, St Louis MO |
| SP | Spartan Aircraft Co, Tulsa OK |
| SW | Schweizer Aircraft Corp, Elmira NY |
| TA | Taylorcraft Aviation Corp, Alliance OH |
| TG | Texas Engr & Mfr Co (TEMCO), Greenville TX |
| TI | Timm Aircraft Corp, Van Nuys CA |
| TP | Texas Engr & Mfr Co (TEMCO), Grand Prairie TX |
| UH | United Helicopter Corp, Palo Alto CA |
| UN | Universal Molded Products, Bristol VA |
| VE | Vega Aircraft Corp, Burbank CA |
| VI | Canadian Vickers, Montreal QUE |
| VL | Vertol Aircraft Corp, Morton PA |
| VN | Vultee Aircraft, Nashville TN |
| VO | Chance Vought Aircraft, Dallas TX |
| VU | Vultee Aircraft, Downey CA |
| VW | Vultee-Stinson Div, Consolidated-Vultee Aircraft Corp, Wayne MI |
| WA | Ward Furniture Co, Fort Smith AR |
| WI | Wichita Engineering, Wichita Falls TX |
| WO | Waco Aircraft Co, Troy OH |