| 1 | SDA | St. Andrews Airways Ltd. | Callsign: Saint Andrews, | CDN | AVCODES |
| 2 | SDA | Sogdiana | | TJ | AVCODES |
| 3 | SDA | Sounds Air Travel & Tourism Ltd. | IATA: S8, | NZ | AVCODES |
| 4 | SDA | St. Andrews Airways | | | ICAO1 |
| 5 | SDA | SAN DIEGO & ARIZONA RAILWAY | | | PWRC |
| 6 | SDA | San Diego and Arizona Railway | | | RSRV |
| 7 | SDA | San Diego & Arizona Railway | | USA | TRAFFIC |
| 8 | SDAA | SELMA DISPOSAL & RECYCLING INC. | | | SCAC4 |
| 9 | SDAC | SUSQUEHANNA ECONOMIC DEVELOPMENT ADMINISTRATIVE COUNCIL OF GOVERNMENT | | | PWRC |
| 10 | SDAC | S & D FREIGHT SERVICE INC | | | SCAC4 |
| 11 | SDAD | SANDMAN, DAVID | | | SCAC4 |
| 12 | SDAE | San Diego and Arizona Eastern Ry. Co. | 4/1938-1/1975; eliminated 1/1980 | | NAKINA |
| 13 | SDAE | San Diego and Arizona Eastern Ry. Co., Kyle Santa Rosa, Inc.—Operation-Over | added 1/1980; 1/1980; eliminated 4/1980; eliminated 10/1980 | | NAKINA |
| 14 | SDAE | San Diego and Arizona Eastern Transportation Co. | added 10/1980 | | NAKINA |
| 15 | SDAE | San Diego and Arizona Eastern Ry. Co. | 4/38-1/75; eliminated 1/80 | | NRHS |
| 16 | SDAE | San Diego and Arizona Eastern Ry. Co., Kyle Santa Rosa, Inc.--Operation-Over | added 1/80; 1/80; eliminated 4/80; eliminated 10/80 | | NRHS |
| 17 | SDAE | San Diego and Arizona Eastern Transportation Co. | added 10/80 | | NRHS |
| 18 | SDAE | SAN DIEGO & ARIZONA EASTERN TRANSPORTATION CO. [SAN DIEGO & ARIZONA EASTERN RY] | | | PWRC |
| 19 | SDAE | San Diego and Arizona Eastern Railway | | | RSRV |
| 20 | SDAF | SAME DAY DELIVERY INC | | | SCAC4 |
| 21 | SDAF | Sudan Air Force | | SUD | TRAFFIC |
| 22 | SDAI | SDR TRUCKING LLC | | | SCAC4 |
| 23 | SDAN | SWEET, DANA H TRUCKING INC | | | SCAC4 |
| 24 | SDAP | SOUTHWEST DEDICATED TRANSPORT LLC | | | SCAC4 |
| 25 | SDAQ | S & D SHIPMANAGEMENT GMBH & CO KG | | | SCAC4 |
| 26 | SDAT | STAR TRANSPORT, INC. | | | SCAC1 |
| 27 | SDAT | STAR TRANSPORT INC | | | SCAC4 |
| 28 | SDAW | SCHROEDER, DM TRUCKING | | | SCAC4 |
| 29 | SDAX | Pacific Southwest Railway Museum Association d/b/a San Diego & Arizona Ry. | 7/2005 (not listed) | | NAKINA |
| 30 | SDAX | PACIFIC SOUTHWEST RAILWAY MUSEUM ASSOC. d/b/a SAN DIEGO & ARIZONA RWY | | | PWRC |
| 31 | SDAX | SAN DIEGO & ARIZONA RAILWAY (PACIFI | | | SCAC4 |
| 32 | SDAY | SAME DAY TRANSPORTATION INC | | | SCAC4 |
