| 1 | STD | Skytrak Aeronautical Systems Ltd. | | GB | AVCODES |
| 2 | STD | Servicos de Aerotransportacion de Aquascalientes, S.A. de C.V. | Callsign: Aero Aguascalientes, | MEX | AVCODES |
| 3 | STD | Servicios De Aerotransportacion De Aguascalientes | | | ICAO1 |
| 4 | STD | Stemberg-Deters Umweltservice GmbH | | DE | VKM |
| 5 | STDA | STOTT & DAVIS MOTOR EXPRESS, INC | | | SCAC1 |
| 6 | STDC | STUDIO CORMORAN | | | SCAC4 |
| 7 | STDD | STATESIDE TRANSPORTATION SERVICES I | | | SCAC4 |
| 8 | STDF | STANDARD FORWARDING LLC | | | SCAC4 |
| 9 | STDM | STUDER TRUCK LINE INC | | | SCAC4 |
| 10 | STDN | SUPER TRANSPORTES DEL NORTE SA DE C | | | SCAC4 |
| 11 | STDO | STINSON STUDIOS INC | | | SCAC4 |
| 12 | STDT | SSD TINDELL TRUCKING LLC | | | SCAC4 |
| 13 | STDU | STAR INTERNATIONALE TRANSPORTE | | | SCAC4 |
| 14 | STDV | SECURITY TRANSPORT AND DELIVERY SERVICE, INC | | | SCAC1 |
| 15 | STDW | STUBBS OIL COMPANY INC | | | SCAC4 |
| 16 | STDX | Standard Steel Car Co. | 7/1923 | | NAKINA |
| 17 | STDX | Standard Steel Car Corp. | 7/1930-7/1932 | | NAKINA |
| 18 | STDX | Standard Fuels, Inc. | added 1/1960; 4/1961-10/1966; eliminated 1/1969 | | NAKINA |
| 19 | STDX | Mobil Oil Corp. | added 1/1969; 4/1970; eliminated 7/1970 | | NAKINA |
| 20 | STDX | Standard Fuels, Inc. | added 1/60; 4/61-10/66; eliminated 1/69 | | NRHS |
| 21 | STDX | Mobil Oil Corp. | added 1/69; 4/70; eliminated 7/70 | | NRHS |
| 22 | STDX | *STANDARD STEEL CAR CORP. | | | PWRC |
| 23 | STDX | *MOBIL OIL CORP. [STANDARD FUELS, INC.] | | | PWRC |
