| 1 | PST | Parsa S.A. d/b/a Air Panama | IATA: 7P, Callsign: Turismo Regional, | PA | AVCODES |
| 2 | PST | Airwork (New Zealand) Ltd. | IATA: HT, Callsign: Post, Designator HT recalled by IATA | NZ | AVCODES |
| 3 | PST | Parsa | | | ICAO1 |
| 4 | PST | Philadelphia Suburban Transportation | 1/1975-1/1980 | | NAKINA |
| 5 | PST | Philadelphia Suburban Transportation | 1/75-1/80 | | NRHS |
| 6 | PST | PHILADELPHIA SUBURBAN TRANSPORTATION | | | PWRC |
| 7 | PST | Philadelphia Suburban Transportation Company | | USA | TRAFFIC |
| 8 | PSTA | POSTEN TAXI INC | | | SCAC3 |
| 9 | PSTA | PACIFIC SHORES TRUCKING & TRANSPORT | | | SCAC4 |
| 10 | PSTB | Puget Sound Tug & Barge | 1/1975-1/1980 | | NAKINA |
| 11 | PSTB | Puget Sound Tug & Barge | 1/75-1/80 | | NRHS |
| 12 | PSTB | PUGET SOUND TUG & BARGE (PUGET SOUND NAVAL SHIP YARD) | | | PWRC |
| 13 | PSTB | PRESTON TRANSPORTATION COMPANY | | | SCAC3 |
| 14 | PSTC | POLE STAR TRANSPORT, INC | | | SCAC3 |
| 15 | PSTC | POLE STAR TRANSPORT INC | | | SCAC4 |
| 16 | PSTC | Philadelphia Suburban Transportation Company | | USA | TRAFFIC |
| 17 | PSTD | P & S TRUCKING INC | | | SCAC3 |
| 18 | PSTD | PST TRANSPORT | | | SCAC4 |
| 19 | PSTE | P & S TRANSFER INC | | | SCAC3 |
| 20 | PSTF | PORT STATES FREIGHT LINES INC | | | SCAC3 |
| 21 | PSTG | P & S TRUCKING INC | | | SCAC3 |
| 22 | PSTH | PHASE III TRUCKING INC | | | SCAC4 |
| 23 | PSTJ | PRASSELL TRANSPORT INC | | | SCAC3 |
| 24 | PSTK | PERNSTEINER TRUCKING INC | | | SCAC3 |
| 25 | PSTL | PUGET SOUND TRUCK LINES, INC | | | SCAC3 |
| 26 | PSTM | PHASE III MOVERS | | | SCAC4 |
| 27 | PSTN | PRAIRIE STATES TERMINALS INC | | | SCAC4 |
| 28 | PSTO | PORTSIDE TRANSPORTATION INC | | | SCAC3 |
| 29 | PSTO | P & S TRANSPORTATION INC | | | SCAC4 |
| 30 | PSTQ | POST TRUCKING INC | | | SCAC3 |
| 31 | PSTR | PROSPECT TRANSPORTATION INC | | | SCAC4 |
| 32 | PSTS | PUGET SOUND TRANSFER & STORAGE, Jayhawk Enterprises, INC | | | SCAC3 |
| 33 | PSTS | PUGET SOUND TRANSFER & STORAGE | | | SCAC4 |
| 34 | PSTT | POOHLI SIDHU TRANSPORT LTD | | | SCAC4 |
| 35 | PSTT | Przedsiebiorstwo Spedycyjne Trade Trans Sp. Z.o.o. | | PL | VKM |
| 36 | PSTU | TETRA PAK PACKAGING SOLUTIONS SPA | | I | BIC |
| 37 | PSTV | P S T VANS INC | | | SCAC3 |
| 38 | PSTV | PAUL AND SONS TRUCKING INC | | | SCAC4 |
| 39 | PSTW | PRICE & SON TRUCKING | | | SCAC3 |
| 40 | PSTX | The David J. Joseph Co. | added 10/2003; 7/2005 | | NAKINA |
| 41 | PSTX | Joseph Transportation Inc. | added 4/2000; 7/2000; eliminated 10/2003 | | NAKINA |
| 42 | PSTX | David J. Joseph Co. | added 4/1999; eliminated 4/2000 | | NAKINA |
| 43 | PSTX | Georgia-Pacific Corp. | eliminated 10/1964 | | NAKINA |
| 44 | PSTX | Puget Sound Pulp & Timber Co. | 1/1950-4/1961 | | NAKINA |
| 45 | PSTX | Puget Sound Pulp & Timber Co. | 1/52-4/61 | | NRHS |
| 46 | PSTX | David J. Joseph Co. | added 4/99; eliminated 4/2000 | | NRHS |
| 47 | PSTX | Joseph Transportation Inc. | added 4/2000; 7/2000 | | NRHS |
| 48 | PSTX | *GEORGIA-PACIFIC CORP. [PUGET SOUND PULP & TIMBER CO.] | | | PWRC |
| 49 | PSTX | +DAVID J. JOSEPH CO. (JOSEPH TRANSPORTATION INC.) | | | PWRC |
| 50 | PSTX | Joseph Transportation | | | RSRV |
| 51 | PSTX | JOSEPH, DAVID J COMPANY, THE | | | SCAC4 |
