| 1 | NWX | Now Airlines Ltd. | Callsign: Now Flight, | GB | AVCODES |
| 2 | NWX | Express Airlines I, Inc. d/b/a Northwest Airlink | Callsign: Flag Ship, | USA | AVCODES |
| 3 | NWX | General Electric Rail Services Corp. | added 1/2000; 7/2000; eliminated 10/2001 | | NAKINA |
| 4 | NWX | General Electric Railcar Services Corp. | added 1/1984; eliminated 1/2000 | | NAKINA |
| 5 | NWX | North American Car Corp. | added 1/1961; 4/1961-1/1980; eliminated 1/1984 | | NAKINA |
| 6 | NWX | North Western Refrigerator Line, a Division of North American Car Corp. | added 10/1958; eliminated 1/1961 | | NAKINA |
| 7 | NWX | North Western Refrigerator Line Co., a Division of North American Car Corp. | added 4/1956; 10/1957; eliminated 10/1958 | | NAKINA |
| 8 | NWX | North Western Refrigerator Line Co. | 7/1930-7/1954 | | NAKINA |
| 9 | NWX | North Western Refrigerator Line Co. | 4/38-1/52 | | NRHS |
| 10 | NWX | North American Car Corp. | Oct-57 | | NRHS |
| 11 | NWX | North Western Refrigerator Line Co., a Division of North American Car Corp. | eliminated 10/58 | | NRHS |
| 12 | NWX | North Western Refrigerator Line, a Division of North American Car Corp. | added 10/58; 4/61 | | NRHS |
| 13 | NWX | North American Car Corp. | 7/65-1/80 | | NRHS |
| 14 | NWX | General Electric Railcar Services Corp. | eliminated 1/2000 | | NRHS |
| 15 | NWX | General Electric Rail Services Corp. | added 1/2000; 7/2000 | | NRHS |
| 16 | NWX | (NATX) G. E. RAILCAR SERVICES CORP [NORTH AMERICAN CAR CORP.; NORTH WESTERN REFRIGERATOR LINE] | | | PWRC |
| 17 | NWX | GE Rail Services | | | RSRV |
| 18 | NWX | North Western Refrigerator Line | | USA | TRAFFIC |
| 19 | NWXA | NEWX INTEGRATED LOGISTICS LLC | | | SCAC4 |
| 20 | NWXL | NORTHWESTERN TRANSPORT LLC | | | SCAC4 |
| 21 | NWXP | NOW EXPRESS | | | SCAC3 |
| 22 | NWXT | NEW WORLD VAN LINES OF T | | | SCAC4 |