| 1 | CQ | Constellation International Airlines S.A. | ICAO: CIN, Callsign: Constellation, Founded on 23 June 1995. Ceased operations on 03 December 1999. | B | AVCODES |
| 2 | CQ | Sunshine Express Airlines Pty. Ltd. d/b/a Sunshine Express Airline | ICAO: EXL, Designator CQ recalled by IATA. ICAO Designator changed from SNH | AUS | AVCODES |
| 3 | CQ | Jet Lag Pty Ltd. t/a Sunshine Express Airlines | | AUS | AVCODES |
| 4 | CQ | Sunshine Express Airlines Pty. Ltd. d/b/a Sunshine Express Airline | ICAO: SNH, ICAO Designator changed to EXL | AUS | AVCODES |
| 5 | CQ | Central Charter Airlines, A.S. (Central Connect Airlines) | ICAO: CCG, Callsign: Central Charter, Founded in 2005. Ceased operations by 30 June 2014. Part of the Central Connect Group. IATA designator changed from 3B*. | CZ | AVCODES |
| 6 | CQ | Coastal Travels Limited | ICAO: CSV, Callsign: Coastel Travel, IATA designator changed from 7I. | EAT | AVCODES |
| 7 | CQ | Charterlines, Inc. | IATA Prefix: 976, | USA | AVCODES |
| 8 | CQ | CLEVELAND QUARIES | | | PWRC |
| 9 | CQA | Coast Air Ltd. | Callsign: Coastair, Ceased operations. | EAK | AVCODES |
| 10 | CQAA | CAN AM AUTO IMPORTERS | | | SCAC4 |
| 11 | CQAC | CAC ASSOCIATES | | | SCAC3 |
| 12 | CQAD | CARPET-ART-DECO INTL | | | SCAC4 |
| 13 | CQAF | CALIFORNIA INTERMODAL ASSOCIATES IN | | | SCAC4 |
| 14 | CQAH | CASH TRUCKING | | | SCAC4 |
| 15 | CQAI | CENTI TRANSPORT INC | | | SCAC4 |
| 16 | CQAM | CAN-AM EAST CARRIERS INC | | | SCAC4 |
| 17 | CQAN | CLAN SHIPPING COMPANY | | | SCAC3 |
| 18 | CQAO | CAMACO FREIGHT SERVICES | | | SCAC4 |
| 19 | CQAP | CARLS CAR CARRIERS INC | | | SCAC4 |
| 20 | CQAQ | CALLAN TRANSPORTATION INC | | | SCAC4 |
| 21 | CQAV | CAVALIER TOOL & MANUFACTURING | | | SCAC4 |
| 22 | CQBA | CAROLINE NAVIGATION, INC. | | | SCAC3 |
| 23 | CQBA | CRANE, B A TRUCKING | | | SCAC4 |
| 24 | CQBK | CARROLLS CREEK TRANSPORT | | | SCAC4 |
| 25 | CQC | Central Queensland Aviation College | | AUS | AVCODES |
| 26 | CQC | Central Queensland Aviation College | | | ICAO1 |
| 27 | CQC | CQC i Sverige AB | | SE | VKM |
| 28 | CQCA | CONTAINER-CARE INTERNATIONAL INC | | | SCAC3 |
| 29 | CQCB | CAST CARIBOU SHIPPING COMPANY LTD. | | | SCAC3 |
| 30 | CQCB | CONSTRUCCIONES COBIAN | | | SCAC4 |
| 31 | CQCC | CARMAN CARTAGE CO | | | SCAC3 |
| 32 | CQCD | COAST CONSOLIDATORS INC | | | SCAC3 |
| 33 | CQCD | COAST | | | SCAC4 |
| 34 | CQCE | CONCRETE INC | | | SCAC3 |
| 35 | CQCE | CLASEN QUALITY CARTAGE LLC | | | SCAC4 |
| 36 | CQCH | CARROLLTON COACH & TOURS | | | SCAC3 |
| 37 | CQCK | C C K INC | | | SCAC3 |
| 38 | CQCL | CENTRAL AMERICAN CONTAINER LINE S A | | | SCAC3 |
| 39 | CQCN | CONQUEST CARRIERS INC | | | SCAC3 |
| 40 | CQCO | CALL-A-COURIER INC | | | SCAC3 |
| 41 | CQCR | CUSTOM CARRIERS INC | | | SCAC3 |
| 42 | CQCR | CUSTOM CARRIERS INC | | | SCAC4 |
| 43 | CQCS | CROP CARE SERVICE INC | | | SCAC3 |
| 44 | CQCT | C C TRUCKING SERVICE | | | SCAC3 |
| 45 | CQDC | CASCADE CARRIERS LTD | | | SCAC4 |
| 46 | CQDN | CDN LOGISTICS INC | | | SCAC4 |
| 47 | CQDS | CATARAQUI DISTRIBUTION SERVICES LIM | | | SCAC3 |
| 48 | CQDT | C D T INC | | | SCAC4 |
| 49 | CQED | CHAMPION EXPRESS LTD | | | SCAC4 |
| 50 | CQEH | CHEETAH TRANSPORTATION LLC (N/K/A G | | | SCAC4 |
| 51 | CQEO | CLEVELAND EXPRESS TRANSPORTATION IN | | | SCAC4 |
| 52 | CQEQ | CASARA, ENRIQUE INC. | | | SCAC3 |
| 53 | CQEW | CHRISTIAN, E W & SONS | | | SCAC3 |
| 54 | CQFL | COOL CARRIERS OF FLORIDA INC | | | SCAC4 |
| 55 | CQGD | COSCO QINGDAO | | | SCAC4 |
| 56 | CQH | Spring Airlines Limited Corporation | IATA: 9S, Callsign: Air Spring, IATA Prefix: 089, IATA designator changed to 9C. Designator 9S reinstated by IATA | PRC | AVCODES |
| 57 | CQH | Spring Airlines Limited Corporation | IATA: 9C, Callsign: Air Spring, IATA Prefix: 089, IATA designator changed from 9S. Designator 9S reinstated by IATA | PRC | AVCODES |
| 58 | CQH | Spring Airlines | IATA: 9S | | ICAO1 |
| 59 | CQHD | CAIN, H D INC | | | SCAC3 |
| 60 | CQHE | CHOICE TRANSPORTATION | | | SCAC4 |
| 61 | CQHM | COASTAL CHEMICAL CO INC | | | SCAC4 |
| 62 | CQHP | CHRISMAN OIL CO INC | | | SCAC4 |
| 63 | CQHR | CHD TRANSPORTATION | | | SCAC4 |
| 64 | CQIA | CORIA TRUCKING | | | SCAC4 |
| 65 | CQIB | COUVOIR QUEBEC INC | | | SCAC4 |
| 66 | CQIC | CMS INTERNATIONAL CO | | | SCAC3 |
| 67 | CQIL | CLARK, S & C TRANSPORT INC | | | SCAC4 |
| 68 | CQIO | COOLEY DELIVERY | | | SCAC3 |
| 69 | CQIT | CIT-SS | | | SCAC4 |
| 70 | CQIY | CARVER OIL COMPANY INC | | | SCAC4 |
| 71 | CQJO | CO-OP CARTAGE CO | | | SCAC3 |
| 72 | CQKI | CARRELL TRUCKING INC | | | SCAC4 |
| 73 | CQKN | C & C TRUCKING | | | SCAC4 |
| 74 | CQLA | CLASSIC TRUCK & TRAILER REPAIRS INC | | | SCAC4 |
| 75 | CQLC | CARRIER LOGISTICS LLC (INTERMODAL) | | | SCAC4 |
| 76 | CQLE | CHARTER CONTAINER LINE | | | SCAC3 |
| 77 | CQLE | CHARTER CONTAINER LINE | | | SCAC4 |
| 78 | CQLI | CALI AMERICA INC CARSON CA | | | SCAC3 |
| 79 | CQLI | CALI AMERICA LOGISTICS INC | | | SCAC4 |
| 80 | CQLK | CLASSIC TRUCKING INC | | | SCAC4 |
| 81 | CQLL | CAL-LES II LLC | | | SCAC4 |
| 82 | CQLM | CORPORATE LIMOUSINE SERVICE INC | | | SCAC3 |
| 83 | CQLM | CTLQ LLC | | | SCAC4 |
| 84 | CQLN | CAPITAL LINES | | | SCAC3 |
| 85 | CQLP | COAST LINE TRANSPORT INC | | | SCAC3 |
| 86 | CQLT | CLT INC | | | SCAC3 |
| 87 | CQMB | COMBINED TRANSPORT LINE, NORTH KANSAS CITY, MO | | | SCAC3 |
| 88 | CQMB | COMBINED TRANSPORT LINE | | | SCAC4 |
| 89 | CQMC | CELESTIAL MARITIME CORP MONROVIA LI | | | SCAC3 |
| 90 | CQMI | CUSTOM CARRIERS | | | SCAC4 |
| 91 | CQML | CANEA MARITIME LTD PIRAEUS GREECE | | | SCAC3 |
| 92 | CQML | CHEM CAST LTD | | | SCAC4 |
| 93 | CQMM | COMPASS MARINE | | | SCAC4 |
| 94 | CQMN | CENTRAL MISSOURI TRANSPORTS LLC | | | SCAC4 |
| 95 | CQMO | COOPERATIVE DELIVERY & DISTRIBUTION | | | SCAC3 |
| 96 | CQMP | COMPONENTES PARA MAQUINAS SA DE CV | | | SCAC4 |
| 97 | CQMV | CHAMPION MOVING & STORAGE INC | | | SCAC3 |
| 98 | CQMY | COWLES QUILTING MACHINES SERVICE IN | | | SCAC4 |
| 99 | CQN | Chong Qing Airlines Co., Ltd | IATA: OQ, Callsign: Chong Qing, Founded on 16 June 2007. Commenced operations on 08 July 2007. | PRC | AVCODES |
| 100 | CQNA | CASTELLA NAVIGATION CORP MONROVIA | | | SCAC3 |
