| 3001 | MFLV | MITCHELLS FREIGHT LLC | | | SCAC4 |
| 3002 | MFLW | MCVICAR FARMS LTD | | | SCAC4 |
| 3003 | MFLX | McColl-Frontenac Oil Co., Ltd. | 7/1930-7/1954; eliminated 1/1956 | | NAKINA |
| 3004 | MFLX | McColl-Frontenac Oil Co., Ltd. | 4/38-1/52 | | NRHS |
| 3005 | MFLX | MCCOLL-FRONTENAC OIL CO., LTD. | | | PWRC |
| 3006 | MFME | MUNIZ FELIX, MARIA DE LOS ANGELES | | | SCAC4 |
| 3007 | MFMG | METROPOLITAN FREIGHT MANAGEMENT INC | | | SCAC4 |
| 3008 | MFMI | MILITARY FIRST MOVERS INC | | | SCAC4 |
| 3009 | MFML | MERCHANTS FAST MOTOR LINES, INC | | | SCAC1 |
| 3010 | MFMO | MOORE FARMERS OIL CO | | | SCAC4 |
| 3011 | MFMT | MATTICE, L FREDERICK FARM & TRUCKIN | | | SCAC4 |
| 3012 | MFMV | MAYFLOWER MILITARY MOVERS LLC | | | SCAC4 |
| 3013 | MFNT | MCFADDEN TRUCKING | | | SCAC4 |
| 3014 | MFNX | Morlunda Farms, Oscar Nelson, Inc. | added 4/1965; added 1/1967; 4/1970; eliminated 7/1971 | | NAKINA |
| 3015 | MFNX | Morlunda Farms | added 1/1963 | | NAKINA |
| 3016 | MFNX | Morlunda Farms, Oscar Nelson, Inc. | added 4/65; added 1/67 | | NRHS |
| 3017 | MFNX | Morlunda Farms | Apr-70 | | NRHS |
| 3018 | MFNX | MORLUNDA FARMS, OSCAR NELSON, INC. | | | PWRC |
| 3019 | MFO | Maschinenfabrik Oerlikon | | CH | TRAFFIC |
| 3020 | MFOC | MANSFIELD SYSTEMS INC | | | SCAC4 |
| 3021 | MFOM | MARATHON FLINT OIL COMPANY | | | SCAC4 |
| 3022 | MFON | MCFARLAND OIL INC | | | SCAC4 |
| 3023 | MFOO | METRO FUEL OIL CORP | | | SCAC4 |
| 3024 | MFOR | MARTIN FUEL OIL CORP | | | SCAC4 |
| 3025 | MFOR | Metrô de Fortaleza | | BR | TRAFFIC |
| 3026 | MFOSJ | Museiföreningen Östra Skånes Järnvägar | | SE | VKM |
| 3027 | MFP | Maine Forest Service | Callsign: Forest Ranger, | USA | AVCODES |
| 3028 | MFPC | MAINES PAPER & FOOD | | | SCAC4 |
| 3029 | MFPL | MARGIL FOREST PRODUCTS INC | | | SCAC4 |
| 3030 | MFPZ | MCFARLAND POLE | | | PWRC |
| 3031 | MFR | Midline Air Freight | Callsign: Midline Freight, | USA | AVCODES |
| 3032 | MFR | Midline Air Freight | | | ICAO1 |
| 3033 | MFRB | MDS FREIGHT | | | SCAC4 |
| 3034 | MFRD | MOUNTAIRE FARMS OF DELAWARE INC | | | SCAC4 |
| 3035 | MFRF | MILFORD TRANS CO INC | | | SCAC4 |
| 3036 | MFRG | MARSHALL FREIGHT INC | | | SCAC4 |
| 3037 | MFRL | MERCHANTS FREIGHT LINE, INC | | | SCAC1 |
| 3038 | MFRL | MERCHANTS FREIGHT LINE INC | | | SCAC4 |
| 3039 | MFRN | M & F TRANSPORTATION INC | | | SCAC4 |
| 3040 | MFRO | MORRIS TRANSFER | | | SCAC4 |
| 3041 | MFRQ | METZ FIRE & RESCUE SUPPLY | | | SCAC4 |
| 3042 | MFRT | MERCURY FREIGHT, INC | | | SCAC1 |
| 3043 | MFRT | MARFRUT | | | SCAC4 |
| 3044 | MFRU | MARFRET S.A. | | F | BIC |
| 3045 | MFRU | MARFRET S A | | | SCAC4 |
| 3046 | MFS | Miller Flying Services, Inc. | Callsign: Miller Time, | USA | AVCODES |
| 3047 | MFS | Miller Flying Services | | | ICAO1 |
| 3048 | MFSA | MINERVA FIDELITY S A | | | SCAC4 |
| 3049 | MFSD | MIRAGE FREIGHT SYSTEM INC | | | SCAC4 |
| 3050 | MFSE | MULTIPLE FUEL SERV INC | | | SCAC4 |
| 3051 | MFSF | MORGAN FREIGHT SYSTEMS | | | SCAC4 |
| 3052 | MFSH | MFS SUPPLY LLC | | | SCAC4 |
| 3053 | MFSI | MONTANARI FUEL SERVICE INC | | | SCAC4 |
| 3054 | MFSJ | MCLAUGHLIN FREIGHT SERVICES INC | | | SCAC4 |
| 3055 | MFSK | MARTINS FARM SUPPLY | | | SCAC4 |
| 3056 | MFSO | MONARCH FREIGHT SOLUTIONS LLC | | | SCAC4 |
| 3057 | MFSP | MFS-USA LOGISTICS INC | | | SCAC4 |
| 3058 | MFSQ | MERCHANTS FIVE (5) STAR LTD | | | SCAC4 |
| 3059 | MFSS | MIDWEST FREIGHTWAY SERVICES LLC | | | SCAC4 |
| 3060 | MFST | MAJESTIC FREIGHT SERVICES LLC | | | SCAC4 |
| 3061 | MFSW | MADISON FREIGHT SYSTEMS, INC | | | SCAC1 |
| 3062 | MFSY | Manna Freight Systems, Inc. | | | SCAC2 |
| 3063 | MFSY | MANNA FREIGHT SYSTEMS INC | | | SCAC4 |
| 3064 | MFT | Multiflight Ltd | Callsign: Yorkair, | GB | AVCODES |
| 3065 | MFT | Multiflight | | | ICAO1 |
| 3066 | MFTE | MORENO FREIGHTS OF TEXAS INC | | | SCAC4 |
| 3067 | MFTH | METAFLO TECHNOLOGIES INC | | | SCAC4 |
| 3068 | MFTL | MARTIN- FOUR (4) TRUCKING INC | | | SCAC4 |
| 3069 | MFTT | MOFFATT, R & L TRANSPORT LTD | | | SCAC4 |
| 3070 | MFTU | MARFRET S.A. | | F | BIC |
| 3071 | MFTY | MARKS FAMILY TRUCKING LLC | | | SCAC4 |
| 3072 | MFUC | MT FUEL CORP | | | SCAC4 |
| 3073 | MFUE | MORIN FUEL | | | SCAC4 |
| 3074 | MFUI | MIDWEST FUELS INC | | | SCAC4 |
| 3075 | MFUL | METRO FUEL | | | SCAC4 |
| 3076 | MFUN | MAGLIN SITE FURNITURE INC | | | SCAC4 |
| 3077 | MFUS | MARFRET | | | SCAC1 |
| 3078 | MFUS | MARFRET CONTAINER LINES | | | SCAC4 |
| 3079 | MFVJ | Mariager - Fårup - Viborg Jernbane (Mariagerbanen) | 1927 - 1966 | DK | jernbanen.dk |
| 3080 | MFVJ | Mariager - Fårup - Viborg Jernbane (Mariagerbanen) | 1927 - 1966 | DK | TRAFFIC |
| 3081 | MFVL | MAYFLOWER VAN LINES LLC | | | SCAC4 |
| 3082 | MFVX | Merchants Despatch Transportation Corp. | added 4/1965; 7/1965-1/1975; eliminated 4/1976; 1/1980 | | NAKINA |
| 3083 | MFVX | Merchants Despatch Transportation Corp. | added 4/65; 7/65-1/75; eliminated 4/76; 1/80 | | NRHS |
| 3084 | MFVX | MERCHANTS DESPATCH TRANSPORTATION CORP. | | | PWRC |
| 3085 | MFWC | MANILA FORWARD CORPS | | | SCAC4 |
| 3086 | MFWI | MEGA FREIGHTWAYS INC | | | SCAC4 |
| 3087 | MFWZ | MAYFLOWER TRANSIT LLC | | | SCAC4 |
| 3088 | MFX | My Freighter Airlines | IATA: C6, Callsign: Whitebird, IATA Prefix: 488, IATA Designator changed from MF*. | UZ | AVCODES |
| 3089 | MFX | My Freighter Airlines | IATA: MF, Callsign: Whitebird, IATA Designator changed to C6. | UZ | AVCODES |
| 3090 | MFX | Merchants Fertilizer Co. | 7/1937 (not listed); 1/1943 (not listed) | | NAKINA |
| 3091 | MFX | Merchants Fertilizer Co. (Armour Car Lines) | 7/1923 | | NAKINA |
| 3092 | MFX | Morris Fertilizer Co. | 8/1920 | | NAKINA |
| 3093 | MFX | MERCHANTS FERTILIZER CO. {MORRIS FERTILIZER CO.] (ARMOUR CAR LINES) | | | PWRC |
| 3094 | MFXC | MTF TRANSPORTATION INC | | | SCAC4 |
| 3095 | MFXS | MFX LLC | | | SCAC4 |
| 3096 | MFXT | MORENO, FELIX TRANSFER | | | SCAC4 |
| 3097 | MFY | Medifly, S.A. de C.V. | Callsign: Medifly Mex, | MEX | AVCODES |
| 3098 | MFZ | Mofaz Air | Callsign: Mofaz Air, | MW | AVCODES |
| 3099 | MFZ | Mofaz Air | | | ICAO1 |
| 3100 | MG | Grand Holdings, Inc. d/b/a Champion Air | ICAO: CCP, Callsign: Champion Air, | USA | AVCODES |
