| 1001 | MBKX | Mitsui Rail Capital, LLC | added 10/2004; 7/2005 | | NAKINA |
| 1002 | MBKX | MRC Rail Services LLC | added 4/1998; added 10/1999; 7/2000; eliminated 10/2004 | | NAKINA |
| 1003 | MBKX | MRC Rail Services L.L.C. | added 4/98; added 10/99; 7/2000 | | NRHS |
| 1004 | MBKX | MITSUI RAIL CAPITAL LLC [MITSUI RAIL SERVICES LLC, MRC RAIL SERVICES, LLC] | | | PWRC |
| 1005 | MBKX | MRC Rail Services | | | RSRV |
| 1006 | MBKX | MITSUI RAIL CAPITAL LLC | | | SCAC4 |
| 1007 | MBKX | Mitsui Rail Capital, LLC | | USA | TRAFFIC |
| 1008 | MBKY | MEADOWS | | | SCAC4 |
| 1009 | MBL | First City Air Plc | Callsign: First City, | GB | AVCODES |
| 1010 | MBL | First City Air | | | ICAO1 |
| 1011 | MBLD | MELTON, BOB TRUCK SERVICE LOGISTICS | | | SCAC4 |
| 1012 | MBLE | MOBILE AIR TRANSPORT | | | SCAC4 |
| 1013 | MBLG | MAYBANK LOGISTICS MANAGEMENT LLC | | | SCAC4 |
| 1014 | MBLH | MARBLEHEAD TRADING COMPANY INC | | | SCAC4 |
| 1015 | MBLI | MR BULTS INC | | | SCAC4 |
| 1016 | MBLJ | MICHIGANTRUCK BROKERAGE LLC | | | SCAC4 |
| 1017 | MBLM | M B LOGISTIC | | | SCAC4 |
| 1018 | MBLO | MINOR BAY LODGE AND OUTPOSTS LTD | | | SCAC4 |
| 1019 | MBLU | MAR BRIDGE LINE INC. | | PA | BIC |
| 1020 | MBLU | MARBARAL INVESTMENTS PTY LTD | | | SCAC4 |
| 1021 | MBLV | METRO, BLAIR | | | SCAC4 |
| 1022 | MBLX | Exxon Mobil Corp. | added 7/2000; 7/2000-7/2005 | | NAKINA |
| 1023 | MBLX | Mobil Oil Corp. | added 1/1995; eliminated 7/2000 | | NAKINA |
| 1024 | MBLX | McColl Brothers Ltd. (McColl-Frontenac Oil Co., Ltd.) | 7/1930-7/1932 | | NAKINA |
| 1025 | MBLX | Mobil Oil Corp. | added 1/95; eliminated 7/2000 | | NRHS |
| 1026 | MBLX | Exxon Mobil Corp. | added 7/2000; 7/2000 | | NRHS |
| 1027 | MBLX | *MCCOLL-FRONTENAC OIL CO., LTD. [MCCOLL BROTHERS LTD.] | | | PWRC |
| 1028 | MBLX | *MUNICIPAL BELT LINE | | | PWRC |
| 1029 | MBLX | +EXXON MOBIL CORP. [MOBIL OIL CORPORATION] | | | PWRC |
| 1030 | MBLX | McColl Brothers Ltd. (Exxon-Mobil Corporation) | | | RSRV |
| 1031 | MBLX | EXXON MOBIL CORPORATION | | | SCAC4 |
| 1032 | MBLY | MABEYS MOVING & STORAGE INC | | | SCAC4 |
| 1033 | MBM | MBM Maas Baumaschinen GmbH & Co. KG | | DE | VKM |
| 1034 | MBMA | MANCEBO, MANUEL G | | | SCAC1 |
| 1035 | MBMA | MANCEBO, MANUEL G TRUCKING INC | | | SCAC4 |
| 1036 | MBMB | MBM GLOBAL LOGISTICS INC | | | SCAC4 |
| 1037 | MBMC | MBM LOGISTICS INC | | | SCAC4 |
| 1038 | MBMH | MBMM LLC | | | SCAC4 |
| 1039 | MBMJ | MBMJ ENTERPRISES LLC | | | SCAC4 |
| 1040 | MBMK | MARTINS BULK MILK SERVICE INC | | | SCAC4 |
| 1041 | MBMN | MBM INTERNATIONAL LOGISTICS LLC | | | SCAC4 |
| 1042 | MBMO | MBM LOGISTICS INC | | | SCAC4 |
| 1043 | MBMQ | MILES BY MIMS | | | SCAC4 |
| 1044 | MBMR | MACARTHUR BRIDGE ST. LOUIS | | | PWRC |
| 1045 | MBMR | Mesquite Belt Modell Railroad | | USA | TRAFFIC |
| 1046 | MBMR | MBM rail s.r.o. | | CZ | VKM |
| 1047 | MBMT | MBM TRANSFER | | | SCAC4 |
| 1048 | MBN | Zambian Airways | IATA: Q3, Callsign: Zambiana, IATA Prefix: 391, Suspened Operation January 2009. ICAO designator changed from MAZ. Formerly Roan Air. ICAO callsin changed from Mines | Z | AVCODES |
| 1049 | MBN | Zambian Airways | IATA: Q3 | | ICAO1 |
| 1050 | MBNE | M B | | | SCAC4 |
| 1051 | MBNP | MODERN BUSINESS TRANSPORTATION | | | SCAC4 |
| 1052 | MBNS | MODERN BUSINESS SERVICE SYSTEMS INC | | | SCAC4 |
| 1053 | MBNW | MARQUEZ BROTHERS NW | | | SCAC4 |
| 1054 | MBO | Mobil Oil Ltd. | Callsign: Mobil, | CDN | AVCODES |
| 1055 | MBO | MB Aero | Callsign: Aerobal, | BY | AVCODES |
| 1056 | MBO | Mobil Oil | | | ICAO1 |
| 1057 | MBOC | MOORE & BALLIEW OIL CO INC | | | SCAC4 |
| 1058 | MBOD | M B OIL LTD CO A NM LLC | | | SCAC4 |
| 1059 | MBOI | M & B LOGISTICS OF ILLINOIS LLC | | | SCAC4 |
| 1060 | MBOK | MILLER, BOB TRUCKING | | | SCAC4 |
| 1061 | MBOQ | MERSE BROTHERS INC | | | SCAC4 |
| 1062 | MBPB | MANDUJA | | | SCAC4 |
| 1063 | MBPI | MICHIGAN BARK PRODUCTS INC | | | SCAC4 |
| 1064 | MBPN | MCLEODS BY PRODUCTS (1978) LTD | | | SCAC4 |
| 1065 | MBPT | MEINTZER BROTHERS PETROLEUM INC | | | SCAC4 |
| 1066 | MBPX | MacMillan-Bloedel Inc. | added 4/1973; 1/1975-1/1994; eliminated 1/1998; 7/2000-7/2005 (not listed) | | NAKINA |
| 1067 | MBPX | MacMillan-Bloedel Products, Inc. | added 10/1971; eliminated 4/1973 | | NAKINA |
| 1068 | MBPX | MacMillan-Bloedel Products, Inc. | added 10/71; eliminated 4/73 | | NRHS |
| 1069 | MBPX | MacMillan-Bloedel Inc. | added 4/73; 1/75-1/94; eliminated 1/98; 7/2000 | | NRHS |
| 1070 | MBPX | MACMILLAN-BLOEDELL INC | | | PWRC |
| 1071 | MBPX | MacMillan-Bloedell | | | RSRV |
| 1072 | MBR | Brazilian Navy Aviation | Callsign: Brazilian Navy, | BR | AVCODES |
| 1073 | MBR | Brazilian Navy Aviation | | | ICAO1 |
| 1074 | MBRB | M BORDER SOLUTIONS | | | SCAC4 |
| 1075 | MBRC | MARIANA & BLOUNTSTOWN RAILROAD CO. | | | PWRC |
| 1076 | MBRD | MABRAND CARRIERS INC | | | SCAC4 |
| 1077 | MBRE | MILLER, BOB RIGGING INC | | | SCAC4 |
| 1078 | MBRI | MATHER BROS INC | | | SCAC4 |
| 1079 | MBRK | MAGIC BROKERAGE INC | | | SCAC4 |
| 1080 | MBRM | McCAMBRIDGE BROS. MATERIAL SUPPLIES | | | SCAC1 |
| 1081 | MBRM | MEZA BARRAGAN, JOSE MANUEL | | | SCAC4 |
| 1082 | MBRO | MAIN BROTHERS OIL CO INC | | | SCAC4 |
| 1083 | MBRQ | M I H BROKERS | | | SCAC4 |
| 1084 | MBRR | Meridian & Bigbee R.R. Co. | 1/1975-1/1980 | | NAKINA |
| 1085 | MBRR | Meridian & Bigbee R.R. Co. | 1/75-1/80 | | NRHS |
| 1086 | MBRR | M & B RAILROAD [MERIDIAN & BIGBEE RR CO.] | | | PWRC |
| 1087 | MBRR | Meridian and Bigbee Railroad | | | RSRV |
| 1088 | MBRR | MBR TRANSPORT INC | | | SCAC4 |
| 1089 | MBRR | Meridian & Bigbee R.R. Co. | | USA | TRAFFIC |
| 1090 | MBRS | MARYS BEARS | | | SCAC4 |
| 1091 | MBRT | M-BAR QUARTER HORSES | | | SCAC4 |
| 1092 | MBRU | MUNTERS DO BRASIL IND ECOM LTDA | | | SCAC4 |
| 1093 | MBRX | Moseley Bros. Refrigerator Express | 7/1923 | | NAKINA |
| 1094 | MBRX | *MOSELEY BROS. REFRIGERATOR EXPRESS | | | PWRC |
| 1095 | MBRX | *MILFORD-BENNINGTON RAILROAD CO. | | | PWRC |
| 1096 | MBS | Mbachi Air/Ground Services Limited | Callsign: Mbachi Air, | MW | AVCODES |
| 1097 | MBS | Mbach Air | | | ICAO1 |
| 1098 | MBS | Montafonerbahn | | A | TRAFFIC |
| 1099 | MBS | Montafonerbahn AG | | AT | VKM |
| 1100 | MBSA | MINOT BUILDERS SUPPLY ASSOCIATION | | | SCAC4 |
