| 1 | NPP | MIR Scientific Industrial Enterprise, Joint-Stock Company | Callsign: Mir Scientific, | RUS | AVCODES |
| 2 | NPPC | NESTLE PURINA PETCARE CO | | | SCAC4 |
| 3 | NPPT | NORTH PACIFIC TRANSPORT | | | SCAC3 |
| 4 | NPPU | NPP SPETSAVIA LLC | | RUS | BIC |
| 5 | NPPX | North Pacific Sea Products Co. | 8/1920 | | NAKINA |
| 6 | NPPX | Nebraska Public Power District | added 4/1977; 1/1980-7/2005 | | NAKINA |
| 7 | NPPX | Nebraska Public Power District | 1/80-7/2000 | | NRHS |
| 8 | NPPX | *NORTH PACIFIC SEA PRODUCTS CO. | | | PWRC |
| 9 | NPPX | +NEBRASKA PUBLIC POWER DISTRICT | | | PWRC |
| 10 | NPPX | Nebraska Public Power District | | | RSRV |
| 11 | NPPX | NEBRASKA PUBLIC POWER CO. | | | SCAC4 |
| 12 | NPPZ | NORTHWEST POWER PLANT | | | PWRC |
