| 1 | SGD | South East Asian Airlines (Seair) International, Inc. | IATA: XO, Callsign: Air Blue, IATA Prefix: 397, | RP | AVCODES |
| 2 | SGD | Sky Gate International Aviation | | | ICAO1 |
| 3 | SGDA | SRAH GOODS CARRIER | | | SCAC4 |
| 4 | SGDG | SKYLAND GRAIN LLC | | | SCAC4 |
| 5 | SGDN | SLEDGE, DANNIE TRUCKING | | | SCAC4 |
| 6 | SGDQ | STRATEGIC DELIVERY SOLUTIONS INC | | | SCAC4 |
| 7 | SGDR | SUPREME GARAGE DOORS INC | | | SCAC4 |
| 8 | SGDS | SURE GROWTH DISTRIBUTING INCORPORAT | | | SCAC4 |
| 9 | SGDT | STAGE DOOR TRANSPORTATION | | | SCAC4 |
| 10 | SGDU | STABILIS GDS INC | | USA | BIC |
| 11 | SGDV | SHOTGUN DELIVERY INC | | | SCAC4 |
