| 1 | MPX | Aeromexpress S.A. de C.V. | IATA: QO, Callsign: Aeromexpress, IATA Prefix: 976, | MEX | AVCODES |
| 2 | MPX | Aeromexpress | IATA: QO | | ICAO1 |
| 3 | MPX | Columbian Carbon Co., Magnetic Pigment Division | 1/1945-1/1952; eliminated 10/1953 | | NAKINA |
| 4 | MPX | Magnetic Pigment Co. | 7/1937-1/1943 | | NAKINA |
| 5 | MPX | Magnetic Pigment Co. | Apr-38 | | NRHS |
| 6 | MPX | Columbian Carbon Co., Magnetic Pigment Division | 1/52; eliminated 10/53 | | NRHS |
| 7 | MPX | COLUMBIAN CARBON CO., MAGNETIC PIGMENT DIV. | | | PWRC |
| 8 | MPXD | MPX INCORPORATED | | | SCAC4 |
| 9 | MPXE | M.A.T. PARCEL EXPRESS, INC | | | SCAC1 |
| 10 | MPXE | M A T EXPRESS | | | SCAC4 |
| 11 | MPXI | MISTER P EXPRESS INC | | | SCAC4 |
| 12 | MPXL | MERCURYPD | | | SCAC4 |
| 13 | MPXP | MAPCO EXPRESS INC | | | SCAC4 |
| 14 | MPXQ | MTP TRANSPORT INC | | | SCAC4 |
| 15 | MPXT | METROPOLITAN TRANSPORT LTD | | | SCAC4 |
