| 1 | SQH | Ford Aire | Callsign: Susquehanna, | USA | AVCODES |
| 2 | SQH | Alaska Juneau Aeronautics, Inc. | Callsign: Sasquatch, Name changed to Seaport Airlines, Inc. | USA | AVCODES |
| 3 | SQH | Seaport Airlines, Inc. | IATA: K5, Callsign: Sasquatch, Ceased operations on 20 September 2016 and filed for Chapter 7 bankruptcy. Name changed from Alaska Juneau Aeronautics, Inc. | USA | AVCODES |
| 4 | SQHC | STROHL OIL CO | | | SCAC4 |
| 5 | SQHD | SAHIR TRUCKING LTD | | | SCAC4 |
| 6 | SQHE | SANDY HILLS ELK RANCH | | | SCAC4 |
| 7 | SQHG | SEA CENTRAL SHIPPING CORPORATION | | | SCAC4 |
| 8 | SQHI | STAHL OIL COMPANY INC | | | SCAC4 |
| 9 | SQHK | SMITH, CURTIS TRUCKING | | | SCAC4 |
| 10 | SQHM | SCHMUCKAL OIL CO | | | SCAC4 |
| 11 | SQHN | SCHREINERS INC | | | SCAC4 |
| 12 | SQHO | SHORES OIL COMPANY | | | SCAC4 |
