| Q2 | MTC | Minerva Airlines | |
| Q2 | DQA | Island Aviation Services | |
| Q3 | MBN | 391 | Zambian Airways |
| Q4 | MAW | Mustique Airways | |
| Q5 | MLA | 519 | 40 Mile Air |
| Q9 | ITB | 151 | Interbrasil Star |
| QA | CBE | 723 | Aerovias Caribe |
| QB | BYC | Northern Airlines Sanya | |
| QC | AZR | 207 | Air Zaire |
| QE | TAH | 067 | Air Moorea |
| QF | QFA | 081 | Qantas Airways |
| QH | LYN | Altyn Air | |
| QI | CIM | 647 | Cimber Air A/S |
| QK | ARN | 983 | Air Nova/Air Canada Regional Airlines |
| QK | JZA | Air Canada Jazz | |
| QL | LAI | 721 | Lesotho Airways |
| QL | RNL | 383 | Aero Lanka |
| QM | AML | 167 | Air Malawi |
| QN | ARR | Air Armenia | |
| QN | ROY | 498 | Royal Cargo |
| QO | MPX | 976 | Aeromexpress Cargo |
| QP | 853 | Airkenya Express | |
| ROA | 384 | Reno Air | |
| QR | QTR | 157 | Qatar Airways |
| QS | TTR | Tatra Air | |
| QS | TVS | Travel Service | |
| QT | TPA | 729 | Tampa Air Cargo |
| QU | UGA | 673 | Uganda Airlines |
| QV | LAO | 627 | Lao Airways |
| QW | TCI | 254 | Turks Air |
| QW | BWG | 049 | Blue Wings |
| QX | QXE | 481 | Horizon Airlines |
| QY | BCS | 615 | European Air Transport |
| QZ | ZAC | Zambia Airways |