| 1 | MNP | Spirit of Manila Airlines Corp | IATA: SM, Callsign: Manila Sky, IATA Prefix: 976, | RP | AVCODES |
| 2 | MNPC | MANNPOWER INC | | | SCAC4 |
| 3 | MNPE | MINNESOTA PRODUCE INC | | | SCAC4 |
| 4 | MNPG | M N P TRANSPORT | | | SCAC4 |
| 5 | MNPN | MACDONALD, STEPHEN | | | SCAC4 |
| 6 | MNPO | MANTEIS TRANSPORT LTD | | | SCAC4 |
| 7 | MNPQ | MAINE COAST PETROLEUM INC | | | SCAC4 |
| 8 | MNPS | MCNEIL PORTRAITS | | | SCAC4 |
| 9 | MNPT | MOON ENTERPRISES INC | | | SCAC4 |
| 10 | MNPW | MALCOLM NAVIGATION PTE LTD | | | SCAC4 |
| 11 | MNPX | Morton International, Inc. | added 4/1997; 7/2000; eliminated 7/2003 | | NAKINA |
| 12 | MNPX | Morton Salt-Division of Morton Thiokol, Inc. | added 4/1987; 1/1994; eliminated 4/1997 | | NAKINA |
| 13 | MNPX | Morton Salt-Division of Morton Norwich Products, Inc. | added 10/1981; eliminated 4/1987 | | NAKINA |
| 14 | MNPX | Morton Salt-Division Norwich Products, Inc. | added 7/1981; eliminated 10/1981 | | NAKINA |
| 15 | MNPX | Morton Salt Co. | added 7/1980; eliminated 7/1981 | | NAKINA |
| 16 | MNPX | Morton Salt Co. | added 7/80; eliminated 7/81 | | NRHS |
| 17 | MNPX | Morton Salt-Division Norwich Products, Inc. | added 7/81; eliminated 10/81 | | NRHS |
| 18 | MNPX | Morton Salt-Division of Morton Norwich Products, Inc. | added 10/81; eliminated 4/87 | | NRHS |
| 19 | MNPX | Morton Salt-Division of Morton Thiokol, Inc. | added 4/87; 1/94; eliminated 4/97 | | NRHS |
| 20 | MNPX | Morton International, Inc. | added 4/97; 7/2000 | | NRHS |
| 21 | MNPX | MORTON INTERNATIONAL, INC. [MORTON SALT-DIV MORTON NORWICH PROD.INC.] | | | PWRC |
| 22 | MNPX | Morton Norwich Products (Morton International) | | | RSRV |
| 23 | MNPY | MN TRANSPORTES | | | SCAC4 |
