| 1 | QP | Airkenya Aviation Ltd. d/b/a Regional Air | IATA Prefix: 853, Name changed to Airkenya Express Ltd. Formerly Airkenya Aviation Ltd. | EAK | AVCODES |
| 2 | QP | Caspair Ltd. | ICAO: SAL, Callsign: Sunbird, Ceased operations. Designator QP recalled by IATA | EAK | AVCODES |
| 3 | QP | Caspair Ltd. | Callsign: Caspair, | EAK | AVCODES |
| 4 | QP | Airkenya Express Ltd. | ICAO: XAK, IATA Prefix: 853, Name changed from Airkenya Aviation Ltd. d/b/a Regional Air. Formerly Airkenya Aviation Ltd. | EAK | AVCODES |
| 5 | QP | SNV Aviation Pvt Ltd t/a Akasa Air | ICAO: AKJ, Callsign: Akasa Air, | IND | AVCODES |
| 6 | QPAC | QUEST PARTNERS COMPANY | | | SCAC3 |
| 7 | QPCU | QUIMPAC DE COLOMBIA | | CO | BIC |
| 8 | QPCU | QUIMPAC DE COLOMBIA | | | SCAC4 |
| 9 | QPCX | General Electric Rail Services Corp. | 7/2000-7/2005 | | NAKINA |
| 10 | QPCX | General Electric Railcar Services Corp. | 1/1994 | | NAKINA |
| 11 | QPCX | The Quaker Petroleum Co. | 7/1930-4/1947 | | NAKINA |
| 12 | QPCX | The Quaker Petroleum Co. | Apr-38 | | NRHS |
| 13 | QPCX | General Electric Railcar Services Corp. | Jan-94 | | NRHS |
| 14 | QPCX | General Electric Rail Services Corp. | Jul-00 | | NRHS |
| 15 | QPCX | *QUAKER PETROLEUM CO. | | | PWRC |
| 16 | QPCX | +GENERAL ELECTRIC RAILCAR SERVICES CORP | | | PWRC |
| 17 | QPCX | General Electric Rail Services Corporation | | | RSRV |
| 18 | QPFI | QUALITY PAPER FIBERS INC | | | SCAC3 |
| 19 | QPIS | QUALITY PALLETS INC | | | SCAC4 |
| 20 | QPKD | QUICK-PAK DELIVERY SERVICE | | | SCAC3 |
| 21 | QPKD | QUICK PICK DELIVERY | | | SCAC4 |
| 22 | QPL | Grupo Desarrollador Qpula | Callsign: Qupula, | MEX | AVCODES |
| 23 | QPLL | QUAIL, PAUL | | | SCAC4 |
| 24 | QPLS | QP-LS LLC | | | SCAC4 |
| 25 | QPML | QUINTERO PACHECO, MARIA LAURA | | | SCAC4 |
| 26 | QPMT | QUANTUM PREMIUM TRANSPORT (A DIVISI | | | SCAC3 |
| 27 | QPMT | QUANTUM PREMIUM TRANSPORT (A DIVISI | | | SCAC4 |
| 28 | QPPD | QUALITY PETROLEUM PRODUCTS INC | | | SCAC4 |
| 29 | QPPG | QUALITREE PROPAGATORS INC | | | SCAC4 |
| 30 | QPPL | QUILLS PICTURE PERFECT LIMOUSINE SE | | | SCAC3 |
| 31 | QPSF | QUALY-PAK SPECIALTY FOODS INC | | | SCAC3 |
| 32 | QPTC | QUEENS PRODUCT TANKER CORPORATION | | | SCAC4 |
| 33 | QPTP | Q P TRANSPORTATION INC | | | SCAC3 |
| 34 | QPXP | QUIK PICK EXPRESS LLC | | | SCAC4 |
| 35 | QPZC | QUINLAN PRETZEL COMPANY | | | SCAC3 |
