| 1 | MLH | ALH Airlines Ltd. | Callsign: South Wind, Name changed to Avion Express Malta Ltd. | M | AVCODES |
| 2 | MLH | Mahalo Air, Inc. | IATA: 8M, Callsign: Mahalo, | USA | AVCODES |
| 3 | MLH | Avion Express Malta Ltd. | Callsign: South Wind, Name changed from ALH Airlines Ltd. | M | AVCODES |
| 4 | MLH | Mahalo Air | | | ICAO1 |
| 5 | MLHC | MAIN LINE | | | SCAC1 |
| 6 | MLHC | MAIN LINE HAULING CO LLC | | | SCAC4 |
| 7 | MLHD | MOUNTAIN LOGISTICS INC | | | SCAC4 |
| 8 | MLHF | M & L TRUCKING | | | SCAC4 |
| 9 | MLHG | MILLER, CHAD TRUCKING LLC | | | SCAC4 |
| 10 | MLHI | MALHI CARRIERS INC | | | SCAC4 |
| 11 | MLHL | MOON LIGHT EXPRESS LOGISTIC LTD | | | SCAC4 |
| 12 | MLHN | METAL LAROCHE INC | | | SCAC4 |
| 13 | MLHR | MELHER TRANSPORT INC | | | SCAC4 |
| 14 | MLHS | MEELHEIM | | | SCAC4 |
| 15 | MLHT | MLH TRUCKING | | | SCAC4 |
| 16 | MLHW | MULTI-CHEM | | | SCAC4 |
| 17 | MLHX | American Refrigerator Transit Co. | added 7/1983 | | NAKINA |
| 18 | MLHX | Missouri Improvement Co. | added 10/1971; 1/1975-1/1980; eliminated 7/1983 | | NAKINA |
| 19 | MLHX | Missouri Improvement Co. | added 10/71; 1/75-1/80 | | NRHS |
| 20 | MLHX | *MISSOURI IMPROVEMENT CO. | | | PWRC |
| 21 | MLHX | *RETIRED 09-02-92 ATP (1852)(ART) [AMERICAN REFRIGERATOR TRANSIT CO.] | | | PWRC |
| 22 | MLHX | American Refrigerator Transit | | | RSRV |
