| 1 | MLK | Millennium Air | Callsign: Nigerjet, | WAN | AVCODES |
| 2 | MLK | Millennium Air | | | ICAO1 |
| 3 | MLKA | MEDICINE LAKE AG SUPPLY | | | SCAC4 |
| 4 | MLKC | MULTI-LINK CONTAINER LINE LLC | | | SCAC4 |
| 5 | MLKD | MLK DELIVERY SERVICE, INC | | | SCAC1 |
| 6 | MLKD | MLK DELIVERY SERVICE INC | | | SCAC4 |
| 7 | MLKE | MARSH LAKE TENTS & EVENTS LTD | | | SCAC4 |
| 8 | MLKF | MAL TRUCKING INC | | | SCAC4 |
| 9 | MLKJ | MID-ATLANTIC TRUCKING LLC | | | SCAC4 |
| 10 | MLKK | MACLEAN, K | | | SCAC4 |
| 11 | MLKL | MLAKER TRANSPORTATION INC | | | SCAC4 |
| 12 | MLKM | MILLERS TRUCKING | | | SCAC4 |
| 13 | MLKP | MELKO ENTERPRISES LTD | | | SCAC4 |
| 14 | MLKQ | MOLITOR, CARL TRUCKING | | | SCAC4 |
| 15 | MLKT | MALKOWSKI TRUCKING | | | SCAC4 |
| 16 | MLKU | MATLACK LEASING LLC | | USA | BIC |
| 17 | MLKU | Matlack Leasing | | | RSRV |
| 18 | MLKU | MATLACK LEASING LLC | | | SCAC4 |
| 19 | MLKW | MELEGS LAKEVIEW ORCHARD | | | SCAC4 |
| 20 | MLKX | Merchants Despatch Transportation Co. | 1/1950-4/1970; eliminated 10/1970 | | NAKINA |
| 21 | MLKX | Merchants Despatch Transportation Co. (reporting marks for Milk Products Refrigerator Line) | 7/1937-4/1938 | | NAKINA |
| 22 | MLKX | Milk Products Refrigerator Line (Merchants Despatch, Inc.) | 7/1935 | | NAKINA |
| 23 | MLKX | Milk Products Refrigerater Line (Merchants Despatch Transportation Corp.) | Apr-38 | | NRHS |
| 24 | MLKX | Merchants Despatch Transportation Co. | 1/52-4/70; eliminated 10/70 | | NRHS |
| 25 | MLKX | MERCHANTS DESPATCH TRANSPORTATION CORP. | | | PWRC |
| 26 | MLKX | MILK PRODUCTS REFRIGERATOR LINE (MERCHANTS DESPATCH TRANSPORTATION CO.) | | | PWRC |
