| 1 | PSD | President Airlines | IATA: TO, IATA Prefix: 540, Desginator TO reinstated by IATA | K | AVCODES |
| 2 | PSD | President Airlines | IATA: TO | | ICAO1 |
| 3 | PSDA | POSEIDON LINES | | | SCAC4 |
| 4 | PSDE | PRESIDENTIAL ENTERPRISES | | | SCAC3 |
| 5 | PSDF | PRECISION SPECIALIZED DIVISION INC | | | SCAC4 |
| 6 | PSDI | PATS DISTRIBUTING INC | | | SCAC3 |
| 7 | PSDJ | PESTELL, D J TRANSPORT LTD | | | SCAC4 |
| 8 | PSDL | POSTAL DELIVERY SERVICE INC | | | SCAC3 |
| 9 | PSDN | PREMUDA SOCIETA DI NAVIGAZIONE P A | | | SCAC3 |
| 10 | PSDN | PREMUDA SOCIETA DI NAVIGAZIONE P A | | | SCAC4 |
| 11 | PSDQ | PIEDMONT TRANSPORT | | | SCAC4 |
| 12 | PSDR | PAY N SAVE DRUG STORES INC | | | SCAC3 |
| 13 | PSDS | PERSONAL DELIVERY SERVICE | | | SCAC3 |
| 14 | PSDS | PESCADOS Y MARISCOS PLAYA HERMOSA D | | | SCAC4 |
| 15 | PSDT | PESCADOR TRANSPORTATION | | | SCAC3 |
| 16 | PSDT | PORTSIDE TRUCKING INC | | | SCAC4 |
| 17 | PSDU | PIGOTT SHAFT DRILLING LIMITED | | GB | BIC |
| 18 | PSDU | PIGOTT SHAFT DRILLING LIMITED | | | SCAC4 |
| 19 | PSDV | POSITIVE DELIVERY SYSTEMS | | | SCAC3 |
| 20 | PSDV | PINDER FARMS | | | SCAC4 |
| 21 | PSDY | PRESTIGE DELIVERY INC | | | SCAC3 |
