| 1 | PAA | Pan American Airways Corp. | IATA: PN, Callsign: Clipper, | USA | AVCODES |
| 2 | PAA | Pan American World Airways (Pan-Am) | IATA: PA, Callsign: Clipper, Name changed from Pan American Airways in January 1950. Ceased operations on 04 December 1991. | USA | AVCODES |
| 3 | PAA | Pan American World Airways | IATA: PA | | ICAO1 |
| 4 | PAA | Pan American Airways | IATA: PA | | ICAO1 |
| 5 | PAA | CONSOLIDATED RAIL CORP. [PENNSYLVANIA & ATLANTIC RAILROAD CO.] | | | PWRC |
| 6 | PAA | PORR-ALPINE Austriarail GmbH | | AT | VKM |
| 7 | PAAA | PARRA, ALFONSO | | | SCAC3 |
| 8 | PAAB | P & A TRANSPORT LLC | | | SCAC4 |
| 9 | PAAC | PORT AUTHORITY OF ALLEGHENY COUNTY (PENNSYLVANIA) | | | PWRC |
| 10 | PAAC | PAN AMERICAN CLIPPER PACKAGE SERVIC | | | SCAC4 |
| 11 | PAAE | PALMER, ARTHUR E | | | SCAC4 |
| 12 | PAAF | PILOT AIR FREIGHT CORP | | | SCAC4 |
| 13 | PAAM | PARCEL TANKERS SERVICES INC | | | SCAC3 |
| 14 | PAAM | PARCEL TANKERS SERVICES INC | | | SCAC4 |
| 15 | PAAN | P & A TRANSPORTATION | | | SCAC3 |
| 16 | PAAN | PAYNE, ANTHONY | | | SCAC4 |
| 17 | PAAP | PARR LUMBER CO | | | SCAC4 |
| 18 | PAAQ | PLANTS AND ANIMALS | | | SCAC4 |
| 19 | PAAU | PT JASATAMA KEMASINDO | | | SCAC4 |
| 20 | PAAV | PAN AMERICAN VAN LINES INC | | | SCAC3 |
| 21 | PAAW | PATTON & ASSOCIATES | | | SCAC3 |
