| 1 | SQC | Singapore Airlines Cargo PTE Ltd. | IATA: SQ, Callsign: Singcargo, IATA Prefix: 618, Merged into Singapore Airlines on 01/04/2018. | SGP | AVCODES |
| 2 | SQC | Singapore Airlines Cargo | IATA: SQ | | ICAO1 |
| 3 | SQCA | SOUTHERN CAL TRANSPORT CO | | | SCAC4 |
| 4 | SQCE | SELECT CLASSIC CARRIERS INC | | | SCAC4 |
| 5 | SQCH | SHIPPERS CHOICE TRANSPORTATION LLC | | | SCAC4 |
| 6 | SQCI | SPECIALTY CARRIERS INC | | | SCAC4 |
| 7 | SQCN | STEELCASE CANADA LIMITED | | | SCAC4 |
| 8 | SQCO | STARCO INC | | | SCAC4 |
| 9 | SQCP | SMT COMPANY | | | SCAC4 |
| 10 | SQCQ | SLCS CORPORATION | | | SCAC4 |
| 11 | SQCT | SPECIALTY CONTRACT CARRIERS INC | | | SCAC4 |
| 12 | SQCV | SILVER CREEK EXPRESS INC | | | SCAC4 |
