| 1 | SEA | Southeast Air, Inc. | Callsign: Southwest Air, | USA | AVCODES |
| 2 | SEA | Southeast Air | | | ICAO1 |
| 3 | SEA | SEASHORE TRANSPORTATION CO INC | | | SCAC4 |
| 4 | SEA | Service des Essences des Armées | | FR | VKM |
| 5 | SEAA | SEA ENTERPRISES | | | SCAC4 |
| 6 | SEAB | Seaboard System | | USA | TRAFFIC |
| 7 | SEAC | SEALAND SERVICE, INC. | | | PWRC |
| 8 | SEAC | SEA-COLD SERVICE, INC | | | SCAC4 |
| 9 | SEAE | SEAPORT EXPRESS TRANSPORT INC | | | SCAC4 |
| 10 | SEAF | SEAWAY FUELS TRUCKING INC | | | SCAC4 |
| 11 | SEAG | SEAGATE LOGISTICS INC | | | SCAC4 |
| 12 | SEAG | Schweizer Electronic AG | | CH | VKM |
| 13 | SEAH | SEAHORSE TRANSPORT INC | | | SCAC4 |
| 14 | SEAI | S E A CORP | | | SCAC4 |
| 15 | SEAL | SEALAND INDUSTRIES LTD | | | SCAC4 |
| 16 | SEAM | SEAMAR CONT SHIPPING INC NJ | | | SCAC4 |
| 17 | SEAN | SEACON | | | SCAC4 |
| 18 | SEANT | SEANTO, S.L. | | ES | VKM |
| 19 | SEAO | SEA ISLAND BONDED STORAGE OF GA INC | | | SCAC4 |
| 20 | SEAP | SEATAINER TRANSPORT LP | | | SCAC4 |
| 21 | SEAQ | SEA TANKERS SHIPPING INC | | | SCAC4 |
| 22 | SEAR | SEAROSE MARINE SA | | | SCAC4 |
| 23 | SEARL | SEA-RAIL NV | | BE | VKM |
| 24 | SEAS | SEASTAR MARINE SA | | | SCAC4 |
| 25 | SEAS | Slovenské elektrárne a.s. | | SK | VKM |
| 26 | SEATD | Southeast Area Transit | SEAT’s member towns are: East Lyme, Griswold, Groton, Lisbon, Montville, New London, Norwich, Stonington and Waterford. | USA | TRAFFIC |
| 27 | SEAU | MAERSK A/S | | DK | BIC |
| 28 | SEAU | SEALAND SERVICE INC | | | PWRC |
| 29 | SEAU | Sea-Land Service Inc | | | RSRV |
| 30 | SEAU | SEA-LAND SERVICE, INC | | | SCAC1 |
| 31 | SEAU | A P MOLLER | | | SCAC4 |
| 32 | SEAW | SEA WINGS USA | | | SCAC4 |
| 33 | SEAX | Seahorse Fuels, Inc. | added 1/1962; 7/1965-4/1970; eliminated 7/1971 | | NAKINA |
| 34 | SEAX | Seahorse Fuels, Inc. | added 1/62; 7/65-4/70 | | NRHS |
| 35 | SEAX | SEAHOURSE FUELS, INC. | | | PWRC |
| 36 | SEAY | SESA EXPRESS INC | | | SCAC4 |
