| 1 | SYX | Astral Aviation Inc. d/b/a Skyway Airlines | IATA: AL, Callsign: Skyway-Ex, Name changed to Skyway Airlines, Inc. d/b/a Midwest Connect | USA | AVCODES |
| 2 | SYX | Skyway Airlines, Inc. d/b/a Midwest Connect | IATA: AL, Callsign: Skyway-Ex, Founded in 1994. Ceased operations in April 2008. Name changed from Astral Aviation Inc. d/b/a Skyway Airlines | USA | AVCODES |
| 3 | SYX | Skywalk Airlines | IATA: AL | | ICAO1 |
| 4 | SYXB | SNYDER TRANSPORT INC | | | SCAC4 |
| 5 | SYXC | SAYLOR TRANSPORTATION LLC | | | SCAC4 |
| 6 | SYXD | STINGRAY TRANSPORT LTD | | | SCAC4 |
| 7 | SYXE | STS | | | SCAC4 |
| 8 | SYXG | SYNERGY TRANSPORT GROUP LLC | | | SCAC4 |
| 9 | SYXH | SYNERGY TRANSPORTATION & LOGISTICS | | | SCAC4 |
| 10 | SYXL | SDI HEAVY TRANSPORT LLC | | | SCAC4 |
| 11 | SYXM | SNYDER TRANSPORT LLC | | | SCAC4 |
| 12 | SYXN | SHOW TYME TRANSPORT INC | | | SCAC4 |
| 13 | SYXO | SURRY TRANSPORTATION LLC | | | SCAC4 |
| 14 | SYXQ | SYOXSA INC | | | SCAC4 |
| 15 | SYXR | SKY TRANSPORT INC | | | SCAC4 |
