| 1 | QU | Uganda Airlines Corp. | ICAO: UGA, Callsign: Uganda, | EAU | AVCODES |
| 2 | QU | Uganda Airlines Holdings Ltd. | ICAO: UGA, Callsign: Uganda, Name changed from Uganda Airlines Corp. Operations restarted. Ceased operations in October 2000 | EAU | AVCODES |
| 3 | QU | Uganda Airlines Corp. | ICAO: UGA, Callsign: Uganda, Name changed to Uganda Airlines Holdings Ltd. Operations restarted. Ceased operations in October 2000 | EAU | AVCODES |
| 4 | QU | East Afrian Airlines Limited | IATA designator change to QU | EAU | AVCODES |
| 5 | QU | East Afrian Airlines Limited | ICAO: UGX, Callsign: Crane, IATA designator changed from QU* | EAU | AVCODES |
| 6 | QU | East Afrian Airlines Limited | ICAO: UGX, Callsign: Crane, IATA designator changed to QU | EAU | AVCODES |
| 7 | QU | Azur Air Ukraine Airlines LLC | ICAO: UTN, Callsign: UT-Ukraine, IATA Prefix: 761, Name changed from Airline Utair - Ukraine w.e.f. October 2015. | UA | AVCODES |
| 8 | QUA | Quassar de Mexico, S.A. de C.V. | Callsign: Quassar, | MEX | AVCODES |
| 9 | QUAB | QUABOAG TRANSFER INC | | | SCAC3 |
| 10 | QUAC | QUAKER CITY FORWARDERS, INC | | | SCAC3 |
| 11 | QUAD | QUAD CITIES SPOTTING SERVICE | | | SCAC3 |
| 12 | QUADR | QUADRUM BVBA | | BE | VKM |
| 13 | QUAE | QUASAR EXPRESS | | | SCAC3 |
| 14 | QUAF | QUICK AIR FREIGHT INC | | | SCAC3 |
| 15 | QUAF | QUICK AIR FREIGHT INC | | | SCAC4 |
| 16 | QUAI | QUALITY MOVING & STORAGE INC | | | SCAC3 |
| 17 | QUAK | QUAKER TRANSPORT, INC | | | SCAC3 |
| 18 | QUAK | QUAKER TRANSPORT INC | | | SCAC4 |
| 19 | QUAM | QUALITY TEAM 1 | | | SCAC4 |
| 20 | QUAN | QUANDT TANK LINES | | | SCAC3 |
| 21 | QUAN | QUANTUM TRANSPORTATION LTD | | | SCAC4 |
| 22 | QUAO | QUALITY CONTAINER TRANSPORT INC | | | SCAC4 |
| 23 | QUAR | QUARRY TRUCK CO INC | | | SCAC3 |
| 24 | QUAS | QUAST TRANSFER, INC | | | SCAC3 |
| 25 | QUAS | QUAY TRANSPORT SERVICES INC | | | SCAC4 |
| 26 | QUASE | Quadrante Servizi S.r.l. | | I | TRAFFIC |
| 27 | QUAT | QUAKER TRANSIT CO INC | | | SCAC3 |
| 28 | QUAX | Redstreak, LLC | 7/2005 (not listed); added 1/2007 | | NAKINA |
| 29 | QUAX | Quality Rail Services, LLC | added 1/2000; 7/2000; eliminated 4/2001 | | NAKINA |
| 30 | QUAX | Quality Rail Services, LLC | added 1/2000; 7/2000; eliminated 4/2001 | | NRHS |
| 31 | QUAX | *QUALITY RAIL SERVICES, LLC | | | PWRC |
| 32 | QUAX | +REDSTREAK, LLC | | | PWRC |
| 33 | QUAX | Quality Rail Services | | | RSRV |
| 34 | QUAX | REDSTREAK LLC | | | SCAC4 |
| 35 | QUAY | QUALITY COURIER&EXPRESS SERVICE | | | SCAC3 |
| 36 | QUAY | QUALITY COURIER & EXPRESS SERVICE | | | SCAC4 |
| 37 | QUBC | QUEBEC PARCEL SERVICE | | | SCAC3 |
| 38 | QUBM | QUALITY BELT MAINTENANCE LTD | | | SCAC4 |
| 39 | QUBR | QUIN BROS CORP | | | SCAC3 |
| 40 | QUBR | QUALITY SOLUTIONS GROUP LLC | | | SCAC4 |
| 41 | QUBT | QUECKBOERNER TRUCKING INC | | | SCAC3 |
| 42 | QUBU | QUBE CONTAINERS LIMITED | | GB | BIC |
| 43 | QUCA | QUALITY CARTAGE, INC | | | SCAC3 |
| 44 | QUCC | QUEEN CARPET CORP | | | SCAC3 |
| 45 | QUCC | QUALITY DRIVE AWAY INC | | | SCAC4 |
| 46 | QUCD | QUICK DELIVERY CO | | | SCAC3 |
| 47 | QUCF | QUAD CITY FREIGHT SERVICE INC | | | SCAC3 |
| 48 | QUCF | QUAD CITY FREIGHT SERVICE INC | | | SCAC4 |
| 49 | QUCG | QUALITY CARTAGE INC | | | SCAC3 |
| 50 | QUCI | QUARRY CONCRETE INC | | | SCAC3 |
| 51 | QUCI | QUEEN CITY FUEL OIL | | | SCAC4 |
| 52 | QUCK | QUICKS MOTOR EXPRESS INC | | | SCAC3 |
| 53 | QUCK | QUICK TRANSFER LTD | | | SCAC4 |
| 54 | QUCL | QUADRA CARTAGE LTD | | | SCAC3 |
| 55 | QUCL | QUADRA COAST CARRIERS LTD | | | SCAC4 |
| 56 | QUCN | QUALITY CONTAINER SERVICE CORP INC | | | SCAC3 |
| 57 | QUCN | QUALFIN INC | | | SCAC4 |
| 58 | QUCO | QUALITY WAREHOUSE CO | | | SCAC3 |
| 59 | QUCW | QUALITY COACHWAY INC | | | SCAC4 |
| 60 | QUDC | QUAD CITIES TRANSPORT INC | | | SCAC3 |
| 61 | QUDI | QUALITY DELIVERY INC | | | SCAC3 |
| 62 | QUDN | QUALITY DINETTES INC | | | SCAC3 |
| 63 | QUDS | QUALITY DELIVERY SERVICE | | | SCAC3 |
| 64 | QUE | Gouvernement Du Quebec, Service Aerien Gouvernemental | Callsign: Quebec, | CDN | AVCODES |
| 65 | QUE | Quebec Government Air Service | | | ICAO1 |
| 66 | QUEB | QUEENS TAXI | | | SCAC3 |
| 67 | QUECKE | Quecke-Reisen | City: Dortmund | D | TRAFFIC |
| 68 | QUED | QUEENSLAND DISTRIBUTORS LTD | | | SCAC3 |
| 69 | QUEE | QUEENAIRE TECHNOLOGIES INC | | | SCAC4 |
| 70 | QUEI | QUEIROLO, ANTHONY HENRY | | | SCAC3 |
| 71 | QUEL | QUELL PETROLEUM SERVICES INC | | | SCAC4 |
| 72 | QUEN | QUEEN & MCDONALD, INCORPORATED | | | SCAC3 |
| 73 | QUENT | Queens-Nassau Transit Lines | City: New York | US-NY | TRAFFIC |
| 74 | QUES | QUESTAR TRANSPORTATION INC | | | SCAC3 |
| 75 | QUES | QUESOS DEL PUEBLO | | | SCAC4 |
| 76 | QUEY | QUALITY ENERGY INC | | | SCAC4 |
| 77 | QUFI | QUAITY FOODS INC | | | SCAC3 |
| 78 | QUFM | QUINCY FARMS | | | SCAC3 |
| 79 | QUFM | QUINCY FARMS | | | SCAC4 |
| 80 | QUFS | QUICKWAY FREIGHT SYSTEMS | | | SCAC4 |
| 81 | QUFT | QUIRIN, FRITZ, TRUCKING, INC | | | SCAC3 |
| 82 | QUFT | QUIRIN, FRITZ TRUCKING INC | | | SCAC4 |
| 83 | QUGO | QUICK DELIVERY SERVICE INC | | | SCAC3 |
| 84 | QUGO | QUICK DELIVERY SERVICE | | | SCAC4 |
| 85 | QUGS | QUANDAHLS GRAIN SERVICE | | | SCAC3 |
| 86 | QUHY | QUEST HYDRAULICS INC | | | SCAC4 |
| 87 | QUI | Aero Quimmco, S.A. de C.V. | Callsign: Quimmco, | MEX | AVCODES |
| 88 | QUI | Aero Quimmco | | | ICAO1 |
| 89 | QUID | QUINN, D L CO INC | | | SCAC3 |
| 90 | QUID | QUINTANA SAMANO, ROBERTO AND DROBER | | | SCAC4 |
| 91 | QUIF | QUALITY FREIGHT INC | | | SCAC3 |
| 92 | QUIG | QUIRING MOTORS LTD | | | SCAC4 |
| 93 | QUII | QUALITY INDUSTRIES INC | | | SCAC3 |
| 94 | QUII | QUINTAINE, J & SON LTD | | | SCAC4 |
| 95 | QUIK | QUIKRETE COMPANIES INC, THE | | | SCAC4 |
| 96 | QUIL | QUINN OIL INC | | | SCAC4 |
| 97 | QUIN | QUINCY STORAGE & TRANSFER CO | | | SCAC3 |
| 98 | QUIQ | QUINN, UDELL S | | | SCAC3 |
| 99 | QUIW | QUICK WAY INC | | | SCAC3 |
| 100 | QUIW | QUICK WAY INC | | | SCAC4 |
