| 1 | NPC | Western Air Couriers, Inc. | Callsign: Norpac, | USA | AVCODES |
| 2 | NPC | Western Air Couriers | | | ICAO1 |
| 3 | NPCC | NORTHPORT CORPORATION OF ST CLOUD | | | SCAC4 |
| 4 | NPCF | NORTH PACIFIC COAST FREIGHT BUREAU | | | SCAC3 |
| 5 | NPCL | NORTH PACIFIC CARRIERS LTD | | | SCAC3 |
| 6 | NPCN | NEWPORT CONTAINER LINE INC | | | SCAC4 |
| 7 | NPCO | NORTHEASTERN PRODUCTS CORP | | | SCAC3 |
| 8 | NPCT | NORTHERN POULTRY COMPANY, THE | | | SCAC4 |
| 9 | NPCU | NEWPORT TANK CONTAINERS (USA) LLC | | USA | BIC |
| 10 | NPCU | Newport Tank Containers | | | RSRV |
| 11 | NPCU | NAVIERA PASCHOLD, S.A. | | | SCAC3 |
| 12 | NPCU | NEWPORT TANK CONTAINERS INC | | | SCAC4 |
| 13 | NPCW | NPC | | | SCAC4 |
| 14 | NPCX | Equistar Chemicals, LP | added 4/1998; 7/2000-7/2005 | | NAKINA |
| 15 | NPCX | Quantum Chemical Corp., USI Division | added 7/1988; 1/1994; eliminated 4/1998 | | NAKINA |
| 16 | NPCX | USI Chemicals Co., Division of National Distillers & Chemical Corp. | added 7/1987; eliminated 7/1988 | | NAKINA |
| 17 | NPCX | U.S. Industrial Chemicals Co., Division of National Distillers and Chemical Corp. | eliminated 7/1987 | | NAKINA |
| 18 | NPCX | Enron Chemical Co. | added 10/1986; eliminated 4/1987 | | NAKINA |
| 19 | NPCX | USI Chemicals Co., Inc. | added 4/1987 | | NAKINA |
| 20 | NPCX | NORCHEM, Inc. | added 1/1986; eliminated 10/1986 | | NAKINA |
| 21 | NPCX | NORCHEM | added 7/1985; eliminated 1/1986 | | NAKINA |
| 22 | NPCX | Northern Petrochemical Co. | added 1/1975; 1/1975-1/1980; eliminated 7/1985 | | NAKINA |
| 23 | NPCX | National Beef Packing Co. | added 10/1968; eliminated 7/1969 | | NAKINA |
| 24 | NPCX | National Packing Co., Inc. | added 7/1967; eliminated 10/1968 | | NAKINA |
| 25 | NPCX | National Car Co. | 1/1946-1/1950 | | NAKINA |
| 26 | NPCX | National Pole Co. | 8/1920-7/1923 | | NAKINA |
| 27 | NPCX | National Packing Co., Inc. | added 7/67; eliminated 10/68 | | NRHS |
| 28 | NPCX | National Beef Packing Co. | added 10/68; eliminated 7/69 | | NRHS |
| 29 | NPCX | Northern Petrochemical Co. | added 1/75; 1/75-1/80 | | NRHS |
| 30 | NPCX | NORCHEM | eliminated 1/86 | | NRHS |
| 31 | NPCX | NORCHEM, Inc. | added 1/86; eliminated 10/86 | | NRHS |
| 32 | NPCX | Enron Chemical Co. | added 10/86; eliminated 4/87 | | NRHS |
| 33 | NPCX | USI Chemicals Co., Inc. | added 4/87 | | NRHS |
| 34 | NPCX | U.S. Industrial Chemicals Co., Division of National Distillers and Chemical Corp. | eliminated 7/87 | | NRHS |
| 35 | NPCX | USI Chemicals Co., Division of National Distillers & Chemical Corp. | added 7/87; eliminated 7/88 | | NRHS |
| 36 | NPCX | Quantum Chemical Corp., USI Division | added 7/88; 1/94; eliminated 4/98 | | NRHS |
| 37 | NPCX | Equistar Chemicals, LP | added 4/98; 7/2000 | | NRHS |
| 38 | NPCX | *NATIONAL POLE CO. | | | PWRC |
| 39 | NPCX | *NATIONAL CAR CO. | | | PWRC |
| 40 | NPCX | *NATIONAL BEEF PACKING CO. [NATIONAL PACKING CO.] | | | PWRC |
| 41 | NPCX | +EQUISTAR CHEMICALS, LP [(USIX) QUANTUM CHEMICAL CORPORATION, USI DIV.; ENRON CHEMICAL CO.; NORCHEM, INMC.; NORTHERN PETROCHEMICAL} | | | PWRC |
| 42 | NPCX | Northern Petrochemical (Equistar Chemicals) | | | RSRV |
| 43 | NPCX | EQUISTAR CHEMICALS LP | | | SCAC4 |
