| 1 | MPO | Transportes Aereos Amparo, S.A. de C.V. | Callsign: Amparo, | MEX | AVCODES |
| 2 | MPO | Transportes Aereos Amparo | | | ICAO1 |
| 3 | MPO | Metropolitano | Real: MP | RA | TRAFFIC |
| 4 | MPOI | MARCO POLO LOGISTICS (LAX) INC | | | SCAC4 |
| 5 | MPOM | METROPOLITAN MOVERS INC | | | SCAC4 |
| 6 | MPON | MARCOPPOLO TRANSPORT | | | SCAC4 |
| 7 | MPOP | MUTUAL PROPANE | | | SCAC4 |
| 8 | MPOR | MELARD TRUCKING | | | SCAC4 |
| 9 | MPOX | Merchants' & Planters' Oil Co. | 8/1920-7/1935; 7/1937 (not listed) | | NAKINA |
| 10 | MPOX | MERCHANTS' & PLANTERS' OIL CO. | | | PWRC |
