| 1 | MPK | Air Indus (Pvt) Ltd | IATA: I6, Ceased operations on 01 July 2015. | PK | AVCODES |
| 2 | MPKC | METRO PACKAGING CORP | | | SCAC4 |
| 3 | MPKD | MACPACK LLC | | | SCAC4 |
| 4 | MPKG | MARPAU TRUCKING | | | SCAC4 |
| 5 | MPKI | METPLAS TRUCKING | | | SCAC4 |
| 6 | MPKN | M P K TRUCKING | | | SCAC4 |
| 7 | MPKO | MPK Olsztyn | | PL | TRAFFIC |
| 8 | MPKOS | Miejskie Przedsiębiorstwo Komunikacji w Ostrowcu Świętokrzyskim | | PL | TRAFFIC |
| 9 | MPKR | MACPHAI | | | SCAC4 |
| 10 | MPKSLU | MPK Slupsk | | PL | TRAFFIC |
| 11 | MPKT | MEHRAN PACIFIC TRUCKING LTD | | | SCAC4 |
| 12 | MPKU | POLYGON MPK, LLC | | BY | BIC |
| 13 | MPKX | Sunburst Cattle Co. | added 7/1973; 1/1975; eliminated 4/1976 | | NAKINA |
| 14 | MPKX | Marhoefer Packing Co., Inc. | 4/1970; eliminated 7/1973 | | NAKINA |
| 15 | MPKX | Michigan Pickle Co. | 1/1950-1/1952; eliminated 7/1954 | | NAKINA |
| 16 | MPKX | Michigan Pickle Co. | Jan-52 | | NRHS |
| 17 | MPKX | Marhoefer Packing Co., Inc. | 4/70; eliminated 7/73 | | NRHS |
| 18 | MPKX | Sunburst Cattle Co. | added 7/73; 1/75; eliminated 4/76 | | NRHS |
| 19 | MPKX | *MICHIGAN PICKLE CO. | | | PWRC |
| 20 | MPKX | *MARHOEFER PACKING CO. | | | PWRC |
| 21 | MPKX | *SUNBURST CATTLE CO. | | | PWRC |
| 22 | MPKX | SUNBURST CATTLE CO. | | | SCAC4 |
