| 1 | PEN | Norsk Flytieneste | Callsign: Norseman, ICAO designator changed to NIR | N | AVCODES |
| 2 | PEN | Peninsula Airways, Inc. | Callsign: Peninsula, | USA | AVCODES |
| 3 | PEN | Peninsula Airways | IATA: KS | | ICAO1 |
| 4 | PEN | Pennsylvania | | USA | TRAFFIC |
| 5 | PENA | PENN-ARBA CORPORATION | | | SCAC4 |
| 6 | PENB | PEN-BAY TRANSPORT, INC | | | SCAC3 |
| 7 | PENB | PEN-BAY TRANSPORT, INC | | | SCAC4 |
| 8 | PENC | PENNCO TRUCKING INC | | | SCAC3 |
| 9 | PENC | PENA CAMPOY, ALFREDO | | | SCAC4 |
| 10 | PENE | PARKINSON ENERGY | | | SCAC4 |
| 11 | PENF | PENINI TRUCKING INC | | | SCAC4 |
| 12 | PENG | PENG, TIAO TRADING INC | | | SCAC4 |
| 13 | PENG | Parenz Engineering | | DE | VKM |
| 14 | PENI | PENN EXPRESS INC | | | SCAC3 |
| 15 | PENJ | POWELL ENTERPRISES | | | SCAC4 |
| 16 | PENLO | PETROLOT Sp. z o.o. | | PL | VKM |
| 17 | PENM | PENNS BEST INC | | | SCAC3 |
| 18 | PENM | PENNS BEST INC | | | SCAC4 |
| 19 | PENN | PENNSYLVANIA TRUCK LINES INC | | | SCAC3 |
| 20 | PENN | PENN STATE EXPRESS | | | SCAC4 |
| 21 | PENNJ | Penn-Jersey Coachways | | US-NJ | TRAFFIC |
| 22 | PENO | PENNINGTON TRANSFER & STORAGE | | | SCAC3 |
| 23 | PENO | PROACTIVE ENVIRONMENTAL | | | SCAC4 |
| 24 | PENP | PATTERN EQUIPMENT & PROTOTYPE INTER | | | SCAC4 |
| 25 | PENQ | PENN TRANSFER CO | | | SCAC3 |
| 26 | PENQ | PANDORA ENTERPRISE | | | SCAC4 |
| 27 | PENR | P E ENTERPRISES | | | SCAC3 |
| 28 | PENR | PATCO ENR | | | SCAC4 |
| 29 | PENS | PENINSULA TRUCK LINES, INC | | | SCAC3 |
| 30 | PENS | PENINSULA TRUCK LINES, INC | | | SCAC4 |
| 31 | PENT | PENTA TRANSPORT LTD | | | SCAC4 |
| 32 | PENV | PENN VAN & STORAGE COMPANY | | | SCAC3 |
| 33 | PENV | PENTA AUTO TRANPORT INC | | | SCAC4 |
| 34 | PENX | Penford Products Co. | added 10/1995; 7/2000-7/2005 | | NAKINA |
| 35 | PENX | Metalurgica Mexicana Penoles, S.A. | added 7/1961; 7/1965-1/1975; eliminated 7/1976 | | NAKINA |
| 36 | PENX | Compania Minera de Penoles, S.A. | 7/1954-4/1961; eliminated 7/1961 | | NAKINA |
| 37 | PENX | Compania Minera de Penoles, S.A. | 10/57-4/61 | | NRHS |
| 38 | PENX | Metalurgica Mexicana Penoles, S.A. | 7/65-1/75; eliminated 7/76 | | NRHS |
| 39 | PENX | Penford Products Co. | added 10/95; 7/2000 | | NRHS |
| 40 | PENX | *METALURGICA MEXICANA PENOLES, SA [COMPANIA MINERA DE PENOLES, SA] | | | PWRC |
| 41 | PENX | +PENFORD PRODUCTS COMPANY | | | PWRC |
| 42 | PENX | Penford Products | | | RSRV |
| 43 | PENY | PENNY EXPRESS INC | | | SCAC3 |
| 44 | PENY | PENNY EXPRESS INC | | | SCAC4 |
| 45 | PENZ | CHASSIS HOLDING INC. | | | SCAC3 |
