| 1 | MSX | Egyptair Cargo | Callsign: Egyptair Cargo, | ET | AVCODES |
| 2 | MSX | Egyptair Cargo | | | ICAO1 |
| 3 | MSX | Morton Salt Co. | 7/1954-4/1961; eliminated 10/1964 | | NAKINA |
| 4 | MSX | Mutual Sales Co. | 8/1920 | | NAKINA |
| 5 | MSX | Morton Salt Co. | 10/57-4/61 | | NRHS |
| 6 | MSX | *MUTUAL SALES CO. | | | PWRC |
| 7 | MSX | *MORTON SALT CO. | | | PWRC |
| 8 | MSXC | M S TRANSPORT | | | SCAC4 |
| 9 | MSXD | MICHAEL AND SONS EXPRESS TRANSPORT | | | SCAC4 |
| 10 | MSXG | MOSAIC LOGISTICS | | | SCAC4 |
| 11 | MSXH | M S TRANSPORT CO | | | SCAC4 |
| 12 | MSXK | MOSKITO EXPRESS | | | SCAC4 |
| 13 | MSXM | MST TRANSPORT | | | SCAC4 |
| 14 | MSXN | MID-STATES EXPRESS, INC | | | SCAC1 |
| 15 | MSXO | MIDLAND SIXTY-SIX OIL CO | | | SCAC4 |
| 16 | MSXQ | MAC SPECIAL TRANSPORT LLC | | | SCAC4 |
| 17 | MSXR | MIDDLESEX TRANSPORTATION AND MANAGE | | | SCAC4 |
| 18 | MSXS | MARTIN ENTERPRISES INC | | | SCAC4 |
| 19 | MSXU | MARINE SPILL RESPONSE CORPORATION, | | | SCAC4 |
| 20 | MSXV | MSL TRANSPORTATION INC | | | SCAC4 |
| 21 | MSXW | MTS TRANSPORT LLC | | | SCAC4 |
| 22 | MSXY | MRS TRANSPORT | | | SCAC4 |
