| 1 | QM | Air Malawi Limited | ICAO: AML, Callsign: Malawi, IATA Prefix: 167, Founded on 01 September 1967. Ceased operations during February 2013. Designator QM reinstated by IATA | MW | AVCODES |
| 2 | QM | Monacair | | MC | AVCODES |
| 3 | QM&S | Quebec, Montreal & Southern Ry. Co. | 7/1923 | | NAKINA |
| 4 | QM&S | CANADIAN NATIONAL RWYS. [QUEBEC, MONTREAL & SOUTHERN RWY. CO.] | | | PWRC |
| 5 | QMAS | QUALITY MOVING & STORAGE INC | | | SCAC3 |
| 6 | QMBC | QUIMBY COMPANY | | | SCAC3 |
| 7 | QMBY | QUIMBY TRUCKING INC | | | SCAC3 |
| 8 | QMBY | QUAM, MARTIN BARRY | | | SCAC4 |
| 9 | QMEI | QUALITY MOVERS EAST INC | | | SCAC3 |
| 10 | QMGS | QUALITY MOVING SERVICE INC | | | SCAC3 |
| 11 | QMHC | QUALITY MOBILE HOME CONTRACTING | | | SCAC3 |
| 12 | QMHS | QUALITY MOBILE HOME TRANSPORT | | | SCAC3 |
| 13 | QMIC | QUANTUM METALS INC | | | SCAC4 |
| 14 | QMKL | QUINDEN MARKETING LTD | | | SCAC4 |
| 15 | QMLD | QUALITY MOLD 2000 | | | SCAC4 |
| 16 | QMLI | QUANTUM LOGISTICS INC | | | SCAC4 |
| 17 | QMLS | QUINTANA, MANUEL S | | | SCAC3 |
| 18 | QMLT | QUEEN MARITIME LTD | | | SCAC4 |
| 19 | QMMI | QUALITY MOVE MANAGEMENT INC | | | SCAC3 |
| 20 | QMMS | Q & M MOTORS | | | SCAC4 |
| 21 | QMMT | QMM TRANSPORT INC | | | SCAC4 |
| 22 | QMNS | QUINN MOVING AND STORAGE | | | SCAC3 |
| 23 | QMPL | QM PLASTICS | | | SCAC4 |
| 24 | QMRH | QUANTUM REHAB (DIVISION OF PRIDE MO | | | SCAC4 |
| 25 | QMRX | Merchants Despatch Transportation Co. | 7/1954-7/1965; eliminated 7/1966 | | NAKINA |
| 26 | QMRX | Merchants Despatch Transportation Co. | 10/57-7/65; eliminated 7/66 | | NRHS |
| 27 | QMRX | MERCHANTS DESPATCH TRANSPORTATION CORP. | | | PWRC |
| 28 | QMS | Quebec, Montreal & Southern Ry. | 4/1938-1/1952 | | NAKINA |
| 29 | QMS | Quebec, Montreal & Southern Ry. Co. (Canadian National Rys.) | 7/1930-7/1936 | | NAKINA |
| 30 | QMS | Quebec, Montreal & Southern Ry. | 4/38-1/52 | | NRHS |
| 31 | QMS | CANADIAN NATIONAL RWYS. [QUEBEC, MONTREAL & SOUTHERN RWY. CO.] | | | PWRC |
| 32 | QMSG | QUINCY MOVING & STORAGE | | | SCAC3 |
| 33 | QMSR | QUALITY MOVING SERVICE INC | | | SCAC4 |
| 34 | QMSS | QUALITY MOVING & STORAGE SERVICES I | | | SCAC4 |
| 35 | QMSV | QUALITY MOVING SERVICE INC | | | SCAC4 |
| 36 | QMSY | QUALITY MOVING SYSTEMS INC | | | SCAC3 |
| 37 | QMVS | QUESSE MOVING & STORAGE | | | SCAC3 |
| 38 | QMX | Quest Mexicana, S.A. de C.V. | Callsign: Quest Mexicana, | MEX | AVCODES |
| 39 | QMXC | QUALITY MEXICAN CRAFTS | | | SCAC4 |
