| 1 | ML | Air Micronesia, Inc. | IATA Prefix: 939, | GUM | AVCODES |
| 2 | ML | Olympic Aviation, S.A. | ICAO: OLY, Callsign: Olavia, Designator ML* recalled by IATA. Founded in 1971. Ceased operation in 2003. | GR | AVCODES |
| 3 | ML | Air Mediterranee | ICAO: BIE, Callsign: Mediterranee, IATA Prefix: 853, Founded in 1997. Ceased operations on 15 February 2016. | F | AVCODES |
| 4 | ML | African Transport Trading And Investment Co. (ATTICO) | ICAO: ETC, Callsign: Tranattico, | SUD | AVCODES |
| 5 | ML | Midway Airlines | ICAO: MID, Callsign: Midway, Founded on 06 August 1976. Filed for Chapter 11 bankruptcy portection March 1991. Ceased operations on 13 November 1991. | USA | AVCODES |
| 6 | ML | Malaysian-Singapore Airlines | Callsign: Emessaye (MAS), | SGP | AVCODES |
| 7 | ML | Anglo Airlines Ltd. d/b/a Anglo Cargo Ltd. | ICAO: ANC, Callsign: Anglo, | GB | AVCODES |
| 8 | ML | Sky Mali | ICAO: FML, Callsign: Eagle Bird, | RMM | AVCODES |
| 9 | ML&T | Morgan's Louisiana & Texas R.R. | 4/1938-7/1954 | | NAKINA |
| 10 | ML&T | Morgan's Louisiana & Texas R.R. (Southern Pacific Lines in Texas and Louisiana) | 8/1920-7/1936 | | NAKINA |
| 11 | ML&T | Morgan's Louisiana & Texas R.R. | 4/38-1/52 | | NRHS |
| 12 | ML&T | MORGAN'S LOUISIANA & TEXAS RAILROAD (SOUTHERN PACIFIC LINES IN TEXAS & LOUISIANA) | | | PWRC |
| 13 | MLA | 40-Mile Air, Ltd. | IATA: Q5, Callsign: Mile Air, IATA chaned from 6M | USA | AVCODES |
| 14 | MLA | 40 Mile Air | IATA: 6M, Callsign: Mile Air, IATA designator changed to Q5* | USA | AVCODES |
| 15 | MLA | 40-Mile Air | IATA: Q5 | | ICAO1 |
| 16 | MLAB | MADISON LOGISTICS INC | | | SCAC4 |
| 17 | MLAC | MARVIN LUMBER AND CEDAR COMPANY | | | SCAC4 |
| 18 | MLAD | MLT INC | | | SCAC4 |
| 19 | MLAF | MLC TRANSPORTATION LLC | | | SCAC4 |
| 20 | MLAI | MCL & ASSOCIATES INC | | | SCAC4 |
| 21 | MLAJ | M & L TRANSIT | | | SCAC4 |
| 22 | MLAK | MAK LOGISTIC LLC | | | SCAC4 |
| 23 | MLAN | MILLENIUM CARRIERS TRUCKING LLC | | | SCAC4 |
| 24 | MLAQ | MTM LOGISTICS INC | | | SCAC4 |
| 25 | MLAT | Morgan’s Louisiana & Texas Railroad | Real: MLT | USA | TRAFFIC |
| 26 | MLAU | MANUFACTURING MANAGEMENT, MALTA LTD | | M | BIC |
| 27 | MLAU | AIR LIQUIDE MALAYSIA SDN BHD | | | SCAC4 |
| 28 | MLAV | MAXCO DISTRIBUTORS INC | | | SCAC4 |
| 29 | MLB | Manaf International Airways | Callsign: Manaf, | RU | AVCODES |
| 30 | MLB | Manaf International Airways | | | ICAO1 |
| 31 | MLBC | M L CEDAR CO INC | | | SCAC4 |
| 32 | MLBD | MILLBROOK DISTRIBUTION SERVICES INC | | | SCAC4 |
| 33 | MLBE | MELVILLE, L & B TRUCKING INC | | | SCAC4 |
| 34 | MLBF | MILLAR BROOKE FARM LTD | | | SCAC4 |
| 35 | MLBH | MANATEE LOGISTICS INC | | | SCAC4 |
| 36 | MLBI | MERLINS TRUCK BROKERAGE INC | | | SCAC4 |
| 37 | MLBM | MARINE LUBRICANTS INC | | | SCAC4 |
| 38 | MLBO | MUNDILL LLC | | | SCAC4 |
| 39 | MLBQ | MULTISERVICIOS LOGISTICA BAKER SA D | | | SCAC4 |
| 40 | MLBS | MUELLER BRASS CO | | | SCAC4 |
| 41 | MLBT | MILLER BROS TRUCKING | | | SCAC4 |
| 42 | MLBV | MILLER, BA LLC | | | SCAC4 |
| 43 | MLBYD | P.W. M&L Roman Mierzbiczak | | PL | VKM |
| 44 | MLC | Malila Airlift | Callsign: Malila, | ZRE | AVCODES |
| 45 | MLC | Malila Airlift | | | ICAO1 |
| 46 | MLC | MICHIGAN LIMESTONE & CHEMICAL | | | PWRC |
| 47 | MLCB | MEL-CO TRANSPORTATION & TRUCK BROKE | | | SCAC4 |
| 48 | MLCD | MATERIALES Y COMPLEMENTOS INDUSTRIA | | | SCAC4 |
| 49 | MLCF | M L & C TRUCKING LLC | | | SCAC4 |
| 50 | MLCI | MOULEBEC INC | | | SCAC4 |
| 51 | MLCK | MATLOCK TRANSPORT | | | SCAC4 |
| 52 | MLCL | MLC LOGISTICS INC | | | SCAC4 |
| 53 | MLCM | MYRTLE LEASING CO | | | SCAC4 |
| 54 | MLCN | MT LOGISTICS CORP | | | SCAC4 |
| 55 | MLCQ | MULE CITY TRUCKING INC | | | SCAC4 |
| 56 | MLCT | MCLEAN CARGO SPECIALISTS INC | | | SCAC4 |
| 57 | MLCU | TEXTAINER EQUIPMENT MANAGEMENT LTD | | BM | BIC |
| 58 | MLCU | N.Y.K. LINE | | | PWRC |
| 59 | MLCU | N.Y.K. Line | | | RSRV |
| 60 | MLCU | TEXTAINER EQUIPMENT MANAGEMENT LIMI | | | SCAC4 |
| 61 | MLCW | MCLEAN CARGO SPECIALISTS | | | SCAC4 |
| 62 | MLCX | American Refrigerator Transit Co. | added 7/1970; 1/1975-7/2005; eliminated 1/2010 | | NAKINA |
| 63 | MLCX | American Refrigerator Transit Co. | added 7/70; 1/75-7/2000 | | NRHS |
| 64 | MLCX | AMERICAN REFRIGERATOR TRANSIT CO. | | | PWRC |
| 65 | MLCX | American Refrigerator Transit | | | RSRV |
| 66 | MLCX | AMERICAN REFRIGERATOR TRANSIT CO. | | | SCAC4 |
| 67 | MLD | Air Moldova | IATA: 9U, Callsign: Air Moldova, IATA Prefix: 572, Designator 9U reinstated by IATA | MD | AVCODES |
| 68 | MLD | Air Moldova | IATA: 9U | | ICAO1 |
| 69 | MLD | Midland | 1/1975-1/1980 | | NAKINA |
| 70 | MLD | Midland Ry. Co. of Manitoba | 4/1938-10/1966 | | NAKINA |
| 71 | MLD | Midland Ry. Co. of Manitoba | 4/38-10/66 | | NRHS |
| 72 | MLD | Midland | 1/75-1/80 | | NRHS |
| 73 | MLD | MIDLAND RY. CO. OF MANITOBA | | | PWRC |
| 74 | MLD | Midland Railway Co. of Manitoba | | | RSRV |
| 75 | MLD | Marineluchtvaartdienst | The Netherlands Naval Aviation Service (Dutch: Marineluchtvaartdienst) is the naval aviation branch of the Royal Netherlands Navy. | NL | TRAFFIC |
| 76 | MLDA | MATILDA SHIPPING LTD | | | SCAC4 |
| 77 | MLDE | MONARCH LITHO DE MEXICO S A DE C V | | | SCAC4 |
| 78 | MLDH | MANI | | | SCAC4 |
| 79 | MLDJ | MLD & SONS INDUSTRIES LLC | | | SCAC4 |
| 80 | MLDK | MACLEOD TRUCKING | | | SCAC4 |
| 81 | MLDM | MONROE, L D TRUCKING | | | SCAC4 |
| 82 | MLDO | MORENO, ALBERTO/LAREDO TRUCKING LLC | | | SCAC4 |
| 83 | MLDV | MAUL, DAVID | | | SCAC4 |
| 84 | MLDW | MANCHES | | | SCAC4 |
| 85 | MLE | Moldaeroservice | Callsign: Moldaero, | MD | AVCODES |
| 86 | MLE | Moldaeroservice | | | ICAO1 |
| 87 | MLEC | MILLER, E C & CO | | | SCAC4 |
| 88 | MLEF | M & L EQUIPMENT LLC | | | SCAC4 |
| 89 | MLEG | ML EXPRESS DELIVERY INC | | | SCAC4 |
| 90 | MLEH | MAIN LINE EXPRESS LLC | | | SCAC4 |
| 91 | MLEK | MALEK, JIM TRUCKING | | | SCAC4 |
| 92 | MLEL | MILLER, L A | | | SCAC4 |
| 93 | MLEP | MILLERS E A ENTERPRISES | | | SCAC4 |
| 94 | MLEQ | MAC DONALD, L. C | | | SCAC1 |
| 95 | MLER | MACLEAN, EURIE | | | SCAC4 |
| 96 | MLEV | MIACHART LLC | | | SCAC4 |
| 97 | MLEW | MCNEISH, LEE WILLIAM | | | SCAC4 |
| 98 | MLEX | Miles Inc. | 7/2000-7/2005 (not listed) | | NAKINA |
| 99 | MLEX | Bulk Equipment Specialist | 1/1994 (not listed) | | NAKINA |
| 100 | MLEX | Bulk Equipment Specialist | Jan-94 | | NRHS |
