| 1 | PDQ | P D C Air Charter, Inc. | Callsign: Dispatch, | USA | AVCODES |
| 2 | PDQ | PDQ Air Charter | | | ICAO1 |
| 3 | PDQC | PDQ COURIER SYSTEM INC | | | SCAC3 |
| 4 | PDQD | PDQ-TWO (2) DELIVERY | | | SCAC3 |
| 5 | PDQD | PDQ DELIVERY | | | SCAC4 |
| 6 | PDQE | PDQ EXPRESS INC | | | SCAC3 |
| 7 | PDQE | PDQ DELIVERY | | | SCAC4 |
| 8 | PDQF | P D Q TRANSPORT LLC | | | SCAC4 |
| 9 | PDQG | PDQ INC | | | SCAC3 |
| 10 | PDQG | PDQ INC | | | SCAC4 |
| 11 | PDQI | PDQ-PAM FORWARDING | | | SCAC3 |
| 12 | PDQI | PDQ COURIER INC | | | SCAC4 |
| 13 | PDQK | PARCEL DELIVERY QUICK INC | | | SCAC3 |
| 14 | PDQN | P-D-Q EXPRESS | | | SCAC3 |
| 15 | PDQN | P D Q TRANSPORTATION INC | | | SCAC4 |
| 16 | PDQO | PDQ BY LIALS CORP | | | SCAC3 |
| 17 | PDQP | PDQ TRANSPORT INC | | | SCAC3 |
| 18 | PDQR | PDQ MESSENGER SERVICE | | | SCAC3 |
| 19 | PDQS | P D Q VAN & STORAGE INC | | | SCAC3 |
| 20 | PDQS | P D Q HOTSHOT SERVICES LTD | | | SCAC4 |
| 21 | PDQT | P D Q INC | | | SCAC3 |
| 22 | PDQT | PDQ/TL EXPRESS INC | | | SCAC4 |
| 23 | PDQU | KATOEN NATIE TANK OPERATIONS N.V. | | B | BIC |
| 24 | PDQU | TILCON FREIGHT NV | | | SCAC4 |
| 25 | PDQV | PDQ VAN & STORAGE INC | | | SCAC3 |
| 26 | PDQV | P D Q VAN & STORAGE INC | | | SCAC4 |
| 27 | PDQW | P D Q WAREHOUSE & DISTRIBUTION INC | | | SCAC3 |
| 28 | PDQX | Castle Capital Corp. | added 1/1971; 1/1975-1/1994; eliminated 1/1997; 7/2000-7/2005 (not listed) | | NAKINA |
| 29 | PDQX | Penn-Dixie Leasing Corp. | added 1/1969; 4/1970; eliminated 1/1971 | | NAKINA |
| 30 | PDQX | Callanan Equipment Corp. | added 10/1967; eliminated 1/1969 | | NAKINA |
| 31 | PDQX | Callanan Equipment Corp. | added 10/67; eliminated 1/69 | | NRHS |
| 32 | PDQX | Penn-Dixie Leasing Corp. | added 1/69; 4/70 | | NRHS |
| 33 | PDQX | Castle Capital Corp. | 1/75-1/94; eliminated 1/97; 7/2000 | | NRHS |
| 34 | PDQX | *PORT DEFIANCE, QUINALT & KLICKITAT RAILROAD | | | PWRC |
| 35 | PDQX | +CASTLE CAPITAL CORP. [PENN-DIXIE LEASING CORP.; CALLANAN EQUIPMENT CORP.] | | | PWRC |
| 36 | PDQX | Castle Capital Corporation | | | RSRV |
| 37 | PDQX | CASTLE CAPITAL CORP. | | | SCAC4 |
| 38 | PDQY | PDQ TRANSIT INC | | | SCAC3 |
