| 6701 | MPCZ | MISSISSIPPI POWER COMPANY | | | PWRC |
| 6702 | MPD | Air Comet, S.A. | IATA: A7, Callsign: Red Comet, IATA Prefix: 352, Ceased operations on 21 December 2009. IATA designator changed from 2Z* | E | AVCODES |
| 6703 | MPD | Air Comet, S.A. | IATA: 2Z, Callsign: Red Comet, Established on 23 December 1996 as Air Plus Comet and started operations on 01 March 1997. Name changed from Air Plus Comet, S.A. w.e.f. January 2007. IATA designator changed to A7 | E | AVCODES |
| 6704 | MPD | Air Plus Comet, S.A. | IATA: 2Z, Callsign: Red Comet, Established on 23 December 1996. Name changed to Air Comet, S.A. w.e.f. January 2007 | E | AVCODES |
| 6705 | MPD | Air Plus Comet | IATA: A7 | | ICAO1 |
| 6706 | MPDB | MAINPRIZE, D B TRANSPORT CO | | | SCAC4 |
| 6707 | MPDF | MAPLE DALE FARMS | | | SCAC4 |
| 6708 | MPDI | MPD INC | | | SCAC4 |
| 6709 | MPDK | MPD TRUCKING | | | SCAC4 |
| 6710 | MPDN | MPD TRANSPORT INC | | | SCAC4 |
| 6711 | MPDR | MATERIAS PRIMAS DE REYNOSA SA DE CV | | | SCAC4 |
| 6712 | MPDS | MULTIPRODUCTOS DEPORTIVOS US SA DE | | | SCAC4 |
| 6713 | MPDW | MPD WELDING LTD | | | SCAC4 |
| 6714 | MPDX | Merchants Despatch Transportation Corp. (reporting marks for Michigan Products Dairy Co.) | 7/1937-1/1941 | | NAKINA |
| 6715 | MPDX | Michigan Producers Dairy Co. (Merchants Despatch, Inc.) | 7/1935 | | NAKINA |
| 6716 | MPDX | Michigan Products Dairy Co. (Merchants Despatch Transportation Corp.) | Apr-38 | | NRHS |
| 6717 | MPDX | MICHIGAN PRODUCTS DAIRY CO. (MERCHANTS DESPATCH TRANSPORTATION CORP.) | | | PWRC |
| 6718 | MPDZ | MARTIN DRAKE POWER PLANT | | | PWRC |
| 6719 | MPE | Air Norterra Inc, d/b/a Canadian North | IATA: 5T, Callsign: Emphis, IATA Prefix: 518, Founded in 1989. Name changed to Canadian North Inc. ICAO callsign changed to Empress. IATA designator changed from 3F* | CDN | AVCODES |
| 6720 | MPE | Air Norterra Inc, d/b/a Canadian North | IATA: 5T, Callsign: Empress, IATA Prefix: 518, Founded in 1989. ICAO designator changed from ANX, ICAO Callsign changed to Norterra | CDN | AVCODES |
| 6721 | MPE | Canadian North Inc. | IATA: 5T, Callsign: Empress, IATA Prefix: 518, Founded in 1989. Name changed from Air Norterra Inc, d/b/a Canadian North w.e.f. 07 May 1998. ICAO callsign changed from Emphis. IATA designator changed from 3F* | CDN | AVCODES |
| 6722 | MPE | Canadian North | IATA: 5T | | ICAO1 |
| 6723 | MPEI | MERCER, PAUL ENTERPRISES INC | | | SCAC4 |
| 6724 | MPES | M P ENVIRONMENTAL SERVICES INC | | | SCAC4 |
| 6725 | MPEX | Motivepower Industries Inc. | 7/2000-7/2005 (not listed) | | NAKINA |
| 6726 | MPEX | Motivepower Industries Inc. | Jul-00 | | NRHS |
| 6727 | MPEX | *MEAD PAPER COMPANY | | | PWRC |
| 6728 | MPEX | +MOTIVEPOWER INDUSTRIES INCORPORATED | | | PWRC |
| 6729 | MPEX | MotivePower Industries | | | RSRV |
| 6730 | MPEX | Motivepower Industries Inc. | | USA | TRAFFIC |
| 6731 | MPF | MAP Executive Flight Service GmbH | Callsign: Executive Waltz, | A | AVCODES |
| 6732 | MPFI | MERRILL POULTRY FARM INC | | | SCAC4 |
| 6733 | MPFL | MACMILLAN OIL COMPANY OF FLORIDA IN | | | SCAC4 |
| 6734 | MPFO | MURPHYS FUEL & OIL CO | | | SCAC4 |
| 6735 | MPFP | MORAN PACIFIC SHIPPING AGENCIES INC | | | SCAC4 |
| 6736 | MPFU | MPF TRADE AND LOGISTICS LTD. | | MAL | BIC |
| 6737 | MPFV | MP5 TECHNOLOGIES LLC | | | SCAC4 |
| 6738 | MPFX | American Refrigerator Transit Co. | added 10/1963; eliminated 1/1965 | | NAKINA |
| 6739 | MPFX | American Refrigerator Transit Co. | eliminated 1/65 | | NRHS |
| 6740 | MPFX | AMERICAN REFRIGERATOR TRANSIT CO. | | | PWRC |
| 6741 | MPGA | MARISCOS PEZ GRANDE | | | SCAC4 |
| 6742 | MPGC | MPG TRUCKING LLC | | | SCAC4 |
| 6743 | MPGF | MCPHEDRAN, GRAY F | | | SCAC4 |
| 6744 | MPGL | MPG | | | SCAC4 |
| 6745 | MPGQ | MPG TRANSPORT | | | SCAC4 |
| 6746 | MPGT | MPG TRUCKING LLC | | | SCAC4 |
| 6747 | MPH | Martinair Holland N.V. | IATA: MP, Callsign: Martinair, IATA Prefix: 129, Name changed from Martin's Luchtvervoermaatschappij (Martin's Aircharter Company M.A.C.) N.V | NL | AVCODES |
| 6748 | MPH | Martinair | IATA: MP | | ICAO1 |
| 6749 | MPH | Martinair Holland N.V. | Real: MPH, MP | NL | TRAFFIC |
| 6750 | MPHB | MACFARLANE PHEASANTS INC | | | SCAC4 |
| 6751 | MPHE | MERINO ALPHA EXPRESS | | | SCAC4 |
| 6752 | MPHF | MICHIGAN PRODUCE HAULERS INC | | | SCAC4 |
| 6753 | MPHK | MORRIS ASPHALT CO INC | | | SCAC4 |
| 6754 | MPHL | MPH LOGISTICS LLC | | | SCAC4 |
| 6755 | MPHS | MCCULLOUGH, PAULINE DAUGHTERS AND S | | | SCAC4 |
| 6756 | MPHU | MURPHY TRANSPORT LTD | | IRL | BIC |
| 6757 | MPHV | MAR-STEPH LOGISTICS | | | SCAC4 |
| 6758 | MPHX | Memphis Packing Corp. (General American Tank Car Corp.) | 7/1935 | | NAKINA |
| 6759 | MPHX | Memphis Packing Corp. (Quaker City Refrigerator Line) | 7/1930-7/1932 | | NAKINA |
| 6760 | MPHX | MEMPHIS PACKING CORP. (QUAKER CITY REFRIGERATOR LINE) | | | PWRC |
| 6761 | MPHY | MURPHY MOTOR FREIGHT LINES INC | | | PWRC |
| 6762 | MPHY | MURPHY | | | SCAC4 |
| 6763 | MPI | Mosphil Aero Inc. | Callsign: Mosphil, Founded in 2005. Commenced operations in 2006. | RP | AVCODES |
| 6764 | MPI | Mosphil Aero | | | ICAO1 |
| 6765 | MPIA | MALPICA MACIEL, MIGUEL ANGEL | | | SCAC4 |
| 6766 | MPID | MILES PROPANE & MPI L | | | SCAC4 |
| 6767 | MPIE | MOUNTAIN PRAISE INDUSTRIES LLC | | | SCAC4 |
| 6768 | MPIG | MARCO PETROLEUM INDUSTRIES INC | | | SCAC4 |
| 6769 | MPIH | MONTREAL PITA | | | SCAC4 |
| 6770 | MPIJ | MATAS PRODUCE INC | | | SCAC4 |
| 6771 | MPIK | MIDWEST POOLS INC | | | SCAC4 |
| 6772 | MPIL | MAC PAPERS INC | | | SCAC4 |
| 6773 | MPILA | MZK Pila | | PL | TRAFFIC |
| 6774 | MPIQ | MARYLAND PAVING INC | | | SCAC4 |
| 6775 | MPIT | UNION PACIFIC RAILROAD | | | PWRC |
| 6776 | MPIT | Missouri Pacific Railroad (Union Pacific Railroad) | | | RSRV |
| 6777 | MPIU | MEMC Pasadena | | | RSRV |
| 6778 | MPIU | MEMC PASADENA INC | | | SCAC4 |
| 6779 | MPIV | MARTIN PRODUCE INC | | | SCAC4 |
| 6780 | MPIW | MPI TRANSPORT INC | | | SCAC4 |
| 6781 | MPIX | Motive Power, Inc. | 7/2000-7/2005 (not listed) | | NAKINA |
| 6782 | MPIX | Myer's Propane Gas Service, Inc. | added 7/1974; 1/1975-1/1980; eliminated 7/1986 | | NAKINA |
| 6783 | MPIX | Snow Ice, Inc. | 7/1937-1/1943 (not listed) | | NAKINA |
| 6784 | MPIX | Myer's Propane Gas Service, Inc. | added 7/74; 1/75-1/80; eliminated 7/86 | | NRHS |
| 6785 | MPIX | Motive Power, Inc. | Jul-00 | | NRHS |
| 6786 | MPIX | *SNOW ICE, INC. | | | PWRC |
| 6787 | MPIX | *MYER'S PROPANE GAS SERVICE, INC. | | | PWRC |
| 6788 | MPIX | +MOTIVE POWER INC. | | | PWRC |
| 6789 | MPIX | Myer's Propane Gas Service (Motive Power) | | | RSRV |
| 6790 | MPIX | MOTIVE POWER INC | | | SCAC4 |
| 6791 | MPIX | Motive Power Incorporated | | USA | TRAFFIC |
| 6792 | MPJ | MAP Management and Planning GmbH | IATA: AQ, Callsign: Mapjet, Designator AQ recalled by IATA | A | AVCODES |
| 6793 | MPJ | MAP Management and Planning GmbH | Callsign: Mapjet, Designator AQ recalled by IATA | A | AVCODES |
| 6794 | MPJ | MAP-Management and Planung | | | ICAO1 |
| 6795 | MPJC | MAJOR PETROLEUM INDUSTRIES | | | SCAC4 |
| 6796 | MPJE | MEDALLS PEREZ, JUANITA E | | | SCAC4 |
| 6797 | MPJI | MACRIE, PAUL J INC | | | SCAC4 |
| 6798 | MPJN | MARINE PROJECTS INC | | | SCAC4 |
| 6799 | MPJT | MARTIN, PERRY, JR | | | SCAC1 |
| 6800 | MPK | Air Indus (Pvt) Ltd | IATA: I6, Ceased operations on 01 July 2015. | PK | AVCODES |
