| 1 | PNR | PAN AIR Lineas Aereas, S.A. | IATA: PV, Callsign: Skyjet, IATA designator changed from PA | E | AVCODES |
| 2 | PNR | ASL Airlines Spain, S.A. | IATA: PV, Callsign: Skyjet, Designator PV recalled by IATA. Name changed from PAN AIR Lineas Aereas, S.A. 24 May 2016. IATA designator changed from PA | E | AVCODES |
| 3 | PNR | ASL Airlines Spain, S.A. | Callsign: Skyjet, Designator PV recalled by IATA. Name changed from PAN AIR Lineas Aereas, S.A. 24 May 2016. IATA designator changed from PA | E | AVCODES |
| 4 | PNR | PAN Air | IATA: PV | | ICAO1 |
| 5 | PNR | Panhandle Northern R.R. Co. | 7/2000-7/2005 | | NAKINA |
| 6 | PNR | Panhandle Northern R.R. Co. | Jul-00 | | NRHS |
| 7 | PNR | PANHANDLE NORTHERN RAILROAD COMPANY | | | PWRC |
| 8 | PNR | Panhandle Northern Railroad | | | RSRV |
| 9 | PNR | PANHANDLE NORTHERN RAILROAD COMPANY | | | SCAC4 |
| 10 | PNRA | PRIONEER TRUCKING & AGGREGATE INC | | | SCAC3 |
| 11 | PNRB | PENA ROBLES, BERNARDO | | | SCAC4 |
| 12 | PNRC | P & R TRUCKING CO | | | SCAC3 |
| 13 | PNRE | PENQUIN REFRIGERATED EXPRESS | | | SCAC3 |
| 14 | PNRF | PETERSEN, A REFRIGERATED TRANSPORT | | | SCAC3 |
| 15 | PNRG | PIONEER GARDENS INC | | | SCAC4 |
| 16 | PNRH | PENNER, HARLAN TRUCKING | | | SCAC3 |
| 17 | PNRH | PENNER, HARLAN TRUCKING | | | SCAC4 |
| 18 | PNRI | PIONEER TRANSPORTATION LTD | | | SCAC4 |
| 19 | PNRJ | PAINE, J R & ASSOCIATES LTD | | | SCAC4 |
| 20 | PNRK | P & R TANK LINES INC | | | SCAC3 |
| 21 | PNRL | PENNER, LARRY ENTERPRISES INC | | | SCAC4 |
| 22 | PNRM | PENNEBAKER READY MIX | | | SCAC3 |
| 23 | PNRO | PENROC INC | | | SCAC3 |
| 24 | PNRO | P N R HOLDINGS | | | SCAC4 |
| 25 | PNRP | P & R TRANSPORTATION INC | | | SCAC3 |
| 26 | PNRQ | PENSER TRANSPORTATION, INC | | | SCAC3 |
| 27 | PNRQ | PENSER TRANSPORTATION INC | | | SCAC4 |
| 28 | PNRR | PIONEER PETROLEUM CO | | | SCAC4 |
| 29 | PNRS | POUNDS, RAYMOND A & SONS TRUCKING | | | SCAC3 |
| 30 | PNRS | PNR TRANSPORT | | | SCAC4 |
| 31 | PNRT | P & R TRANSPORTATION, LTD | | | SCAC3 |
| 32 | PNRU | PANMAR LTD | | | SCAC4 |
| 33 | PNRW | Piedmont and Northern Railway (Patriot Rail Corporation) | | | RSRV |
| 34 | PNRW | P & R TRUCKING INC | | | SCAC3 |
| 35 | PNRX | United States Atomic Energy Commission, Pittsburgh Naval Reactors Office | added 7/1970; eliminated 4/1974; 1/1975-1/1980 | | NAKINA |
| 36 | PNRX | Pioneer Oil & Refining Co. | 7/1935-4/1947; 1/1950 (not listed) | | NAKINA |
| 37 | PNRX | Pioneer Oil & Refining Co. | Apr-38 | | NRHS |
| 38 | PNRX | United States Atomic Energy Commission, Pittsburgh Naval Reactors Office | added 7/70; eliminated 4/74; 1/75-1/80 | | NRHS |
| 39 | PNRX | *PIONEER OIL & REFINING CO. | | | PWRC |
| 40 | PNRX | *U. S. ATOMIC ENERGY COMMISSION, PIUTTSBURGH NAVAL REACTORS OFFICE | | | PWRC |
