| 1 | PGX | Paragon Air Express, Inc. | Callsign: Paragon Express, | USA | AVCODES |
| 2 | PGX | Paragon Air Express | | | ICAO1 |
| 3 | PGX | Union Tank Car Co. | 1/1950 (not listed) | | NAKINA |
| 4 | PGX | Pacific Gas Corp. | 4/1947 | | NAKINA |
| 5 | PGX | General American Transportation Corp. | 7/1937-4/1938 | | NAKINA |
| 6 | PGX | The Procter & Gamble Transportation Co. | 8/1920-7/1935 | | NAKINA |
| 7 | PGX | The Procter & Gamble Transportation Co. (General American Transportation Corp.) | Apr-38 | | NRHS |
| 8 | PGX | *GENERAL AMERICAN TRANSPORTATION CORP. [PROCTOR & GAMBLE TRANSPORTATION CO.] | | | PWRC |
| 9 | PGX | *PACIFIC GAS CORP. (UNION TANK CAR CO.) | | | PWRC |
| 10 | PGXC | PAGE TRANSPORT INC | | | SCAC4 |
| 11 | PGXI | PAIGE TRANSPORT INC | | | SCAC4 |
| 12 | PGXN | PENN RIDGE TRANSPORTATION INC | | | SCAC4 |
| 13 | PGXP | PEGASUS EXPRESS | | | SCAC3 |
| 14 | PGXS | PIG-TAINER EXPRESS CORP | | | SCAC3 |
| 15 | PGXS | PIG-TAINER INC | | | SCAC4 |
| 16 | PGXT | PACER TRANSPORTATION SOLUTIONS INC | | | SCAC4 |
| 17 | PGXU | FLORENS ASSET MANAGEMENT COMPANY LIMITED | | HK | BIC |
| 18 | PGXU | PL SHIPPING & LOGISTICS LTD | | | SCAC4 |
| 19 | PGXV | PROGRESSIVE TRANSPORTATION SERVICES | | | SCAC4 |
