| 1 | PDC | Potomac Air, Inc. | IATA: BK, Callsign: District, IATA Prefix: 522, Formed out of merger of United Air Lines and US Airways | USA | AVCODES |
| 2 | PDC | Potomac Air | IATA: BK | | ICAO1 |
| 3 | PDC | PINNEY DOCK CO. | | | PWRC |
| 4 | PDCB | PACIFIC DAIRY CENTRE LTD | | | SCAC4 |
| 5 | PDCE | PACKAGE DELIVERY COMPANY | | | SCAC4 |
| 6 | PDCH | PDC GLASS OF MICHIGAN INC | | | SCAC4 |
| 7 | PDCI | PREFERRED CARRIERS INC | | | SCAC4 |
| 8 | PDCL | PETREDEC LTD., HAMILTON, BERMUDA | | | SCAC3 |
| 9 | PDCL | PETREDEC LTD BERMUDA | | | SCAC4 |
| 10 | PDCM | PHELPS DODGE CORP. (MORENCI BRANCH) | | | PWRC |
| 11 | PDCM | PRODUCT DISTRIBUTION COMPANY | | | SCAC3 |
| 12 | PDCN | PHELPS DODGE CORP. (NEW CORNELIA MINE, AJO, AZ) | | | PWRC |
| 13 | PDCO | PORT DISTRIBUTING CORP | | | SCAC3 |
| 14 | PDCP | PARADICE CONTAINER PORT (DIV THOMAS | | | SCAC3 |
| 15 | PDCQ | PAS POINT DRAYAGE CO | | | SCAC3 |
| 16 | PDCQ | PADILLA, CESAR | | | SCAC4 |
| 17 | PDCR | PADENA CORP | | | SCAC3 |
| 18 | PDCR | PRADON CONSTRUCTION & TRUCKING CO I | | | SCAC4 |
| 19 | PDCS | PEDASTA s.r.o. | | CZ | VKM |
| 20 | PDCT | PDC TRUCKING COMPANY & SHENANDOAH DISTRIBUTION CENTERS | | | SCAC3 |
| 21 | PDCU | PEORIA DISPOSAL COMPANY | | | SCAC3 |
| 22 | PDCV | PRODUCTIVE TRANSPORTATION INC | | | SCAC3 |
| 23 | PDCW | PHOENIX DRILLING CORP | | | SCAC4 |
| 24 | PDCZ | PORTLAND DEVELOPMENT COMMISSION | | | PWRC |
