| 1 | CD | Alliance Air | ICAO: LLR, Callsign: Allied, IATA Prefix: 296, Name changed to Air India Regional. | IND | AVCODES |
| 2 | CD | Air Commuter | | GB | AVCODES |
| 3 | CD | Trans-Provincial Airlines Ltd. | ICAO: TPY, Callsign: Trans Provincial, Designator CD recalled by IATA | CDN | AVCODES |
| 4 | CD | Air Korea Co. Ltd. | ICAO: AKA, Designator CD recalled by IATA | ROK | AVCODES |
| 5 | CD | Corendon Dutch Airlines | ICAO: CND, Callsign: Dutch Corendon, IATA Prefix: 503, | NL | AVCODES |
| 6 | CD | CITY OF DALLAS | | | PWRC |
| 7 | CD | | | CZ | TRAFFIC |
| 8 | CD | České dráhy, a.s. | | CZ | VKM |
| 9 | CD&C | Cumberland Ry. & Coal Co. | 7/1923-4/1961 | | NAKINA |
| 10 | CD&C | Cumberland Ry. & Coal Co. | 7/23-4/61 | | NRHS |
| 11 | CD&C | CUMBERLAND RWY. & COAL CO. | | | PWRC |
| 12 | CD&M | Clinton, Davenport & Muscatine Ry. Co. | 7/1930-7/1936 | | NAKINA |
| 13 | CD&M | Clinton, Davenport & Muscatine R.R. | 7/1923 | | NAKINA |
| 14 | CD&M | Clinton, Davenport & Muscatine R.R. | 23-Jul | | NRHS |
| 15 | CD&M | CLINTON, DAVENPORT & MUSCATINE RWY. | | | PWRC |
| 16 | CDA | Aerocardal | Callsign: Cardal, ICAO callsign changed to Aerocardal | RCH | AVCODES |
| 17 | CDA | Aerocardal | Callsign: Aerocardal, ICAO callsign changed from Cardal | RCH | AVCODES |
| 18 | CDA | Aerocardal | | | ICAO1 |
| 19 | CDA | Central de Aragon | | E | TRAFFIC |
| 20 | CDAA | CHIMEX TRUCKING AND TRADING INC | | | SCAC4 |
| 21 | CDAA | Aerocardal | Real: CDA | RCH | TRAFFIC |
| 22 | CDAB | CONSOLIDATED BUS CO INC | | | SCAC3 |
| 23 | CDAB | COLLECTIONS DABA-DOO INC | | | SCAC4 |
| 24 | CDAC | Bangor and Aroostook Rd. Co. | added 4/2001; eliminated 4/2002; 7/2005 | | NAKINA |
| 25 | CDAC | Canadian American R.R. Co. | added 4/1995; 7/2000; eliminated 4/2001 | | NAKINA |
| 26 | CDAC | Canadian American R.R. Co. | added 4/95; 7/2000; eliminated 4/2001 | | NRHS |
| 27 | CDAC | Bangor and Aroostook Rd. Co. | added 4/2001 | | NRHS |
| 28 | CDAC | BANGOR & AROOSTOOK RAILROAD (MONTREAL, MAINE & ATLANTIC RWY) [CANADIAN AMERICAN RAILROAD] | | | PWRC |
| 29 | CDAC | Canadian American Railroad (Montreal, Maine and Atlantic) | | | RSRV |
| 30 | CDAC | Canadian American Railroad | | CDN | TRAFFIC |
| 31 | CDAD | COUER D ALENE DELIVERY SERVICE | | | SCAC3 |
| 32 | CDAE | COMPAGNIE D' AFFRETEMENT ET DE TRAN | | | SCAC3 |
| 33 | CDAE | COTTONWOOD CREEK INC | | | SCAC4 |
| 34 | CDAF | CAN-AMERICA DRILLING INC | | | SCAC4 |
| 35 | CDAG | CANADIAN-GULF LINE LIMITED | | | SCAC3 |
| 36 | CDAH | CARDONA TRUCKING INC | | | SCAC3 |
| 37 | CDAI | CUNHA DRAYING | | | SCAC3 |
| 38 | CDAJ | CANADA-JET TRANSPORTATION | | | SCAC3 |
| 39 | CDAK | COLORADO ATLANTIC ENTERPRISES INC | | | SCAC3 |
| 40 | CDAM | CANADIAN AMERICAN TRANSPORTATION C | | | SCAC3 |
| 41 | CDAM | CANADIAN AMERICAN TRANSPORTATION C | | | SCAC4 |
| 42 | CDAN | COORDINATED DELIVERY & INSTALLATION | | | SCAC3 |
| 43 | CDAN | COASTAL DANCE RAGE | | | SCAC4 |
| 44 | CDAP | CDC TRANSPORT LLC | | | SCAC4 |
| 45 | CDAQ | CONDA, WESLEY D INC | | | SCAC3 |
| 46 | CDAQ | CELLAR DOOR ANTIQUES | | | SCAC4 |
| 47 | CDAS | CATE, DICK & SONS TRUCKING CO | | | SCAC3 |
| 48 | CDAS | CANADA DAWN LTD | | | SCAC4 |
| 49 | CDAT | CONTINENTAL TRANSPORTATION AND DIST | | | SCAC4 |
| 50 | CDAU | CANADIAN TIRE CORPORATION | | | PWRC |
| 51 | CDAU | Canadian Tire Corporation Ltd. | | | RSRV |
| 52 | CDAV | CANTRELL, DAVE, TRUCKING | | | SCAC3 |
| 53 | CDAV | CANTRELL, DAVE TRUCKING | | | SCAC4 |
| 54 | CDAW | CASCADE DRAYAGE AND WAREHOUSING, INC | | | SCAC3 |
| 55 | CDAY | COOK DRYWALL AND ACOUSTICAL SUPPLY | | | SCAC4 |
| 56 | CDAZ | CANADIAN TIRE CORPORATION | | | PWRC |
| 57 | CDAZ | Canadian Tire Corporation Ltd. | | | RSRV |
| 58 | CDAZ | CANADIAN TIRE CORPORATION LIMITED | | | SCAC4 |
| 59 | CDB | Air Cordoba | Callsign: Air Cordoba, | E | AVCODES |
| 60 | CDBA | CDB CARTAGE INC | | | SCAC3 |
| 61 | CDBA | CDB CARTAGE INC | | | SCAC4 |
| 62 | CDBB | CHOLLA DISTRIBUTING COMPANY INC | | | SCAC4 |
| 63 | CDBC | CENTRAL DISTRIBUTION CARRIERS INC | | | SCAC3 |
| 64 | CDBC | CORRUGADOS DE BC | | | SCAC4 |
| 65 | CDBD | C & D BONDED DELIVERY SERVICE INC | | | SCAC3 |
| 66 | CDBE | CORPORATIVO DE TRANSPORTE INTERNACI | | | SCAC4 |
| 67 | CDBF | CJ DELIVERY SERVICE INC | | | SCAC4 |
| 68 | CDBG | CREST DISTRIBUTING | | | SCAC3 |
| 69 | CDBG | CREST DISTRIBUTING INC | | | SCAC4 |
| 70 | CDBI | COORDINATED CONSOLIDATORS & CARTAGE | | | SCAC3 |
| 71 | CDBI | CHILDS, ROBERT INC | | | SCAC4 |
| 72 | CDBJ | CENTRAL DETALLISTA SA DE CV | | | SCAC4 |
| 73 | CDBL | CONDOR LINES | | | SCAC3 |
| 74 | CDBL | CODE BLUE EXPEDITE INC | | | SCAC4 |
| 75 | CDBO | COASTAL DISTRIBUTION CENTER INC | | | SCAC3 |
| 76 | CDBO | CD LOGISTICS | | | SCAC4 |
| 77 | CDBP | CALHOUN DISTRIBUTION, INC | | | SCAC3 |
| 78 | CDBP | CALHOUN DISTRIBUTION INC | | | SCAC4 |
| 79 | CDBQ | CAMELOT DISTRIBUTION LLC | | | SCAC4 |
| 80 | CDBR | CONSOLIDATED DISTRIBUTION SERVICES | | | SCAC3 |
| 81 | CDBR | CONSOLIDATED DISTRIBUTION SERVICES | | | SCAC4 |
| 82 | CDBS | CAD BUILDING SUPPLIES | | | SCAC3 |
| 83 | CDBS | CODY BOOKS LTD | | | SCAC4 |
| 84 | CDBT | CAIDIN BOBBY TRUCKING | | | SCAC3 |
| 85 | CDBW | CLASSIC DISTRIBUTION AND WAREHOUSE | | | SCAC3 |
| 86 | CDBW | CDB INC | | | SCAC4 |
| 87 | CDBX | Consolidated Dressed Beef Co., Inc. | added 7/1967; 4/1970; eliminated 11/1973 | | NAKINA |
| 88 | CDBX | Consolidated Dressed Beef Co., Inc. | added 7/67; 4/70; eliminated 11/73 | | NRHS |
| 89 | CDBX | CONSOLIDATED DRESSED BEEF CO. INC. | | | PWRC |
| 90 | CDBY | CEDAR BAY TRANSPORT | | | SCAC3 |
| 91 | CDBY | C & D CONTAINER SERVICE INC | | | SCAC4 |
| 92 | CDC | Carga Del Caribe, S.A. de C.V. | Callsign: Carga Delcaribe, | MEX | AVCODES |
| 93 | CDC | CDI Cargo Airline Limited | IATA: GJ, Callsign: Hualong, IATA Prefix: 891, Name changed to Zhejiang Loong Airlines Co., Ltd. Founded in April 2011. | PRC | AVCODES |
| 94 | CDC | Zhejiang Loong Airlines Co., Ltd. | IATA: GJ, Callsign: Hualong, IATA Prefix: 891, ICAO Callsign changed to Loong Air. | PRC | AVCODES |
| 95 | CDC | Zhejiang Loong Airlines Co., Ltd. | IATA: GJ, Callsign: Loong Air, IATA Prefix: 891, ICAO Callsign changed from Hualong. | PRC | AVCODES |
| 96 | CDC | CUMBERLAND RY. & COAL CO. | | | PWRC |
| 97 | CDC | CD Cargo | | CZ | TRAFFIC |
| 98 | CDC | ČD Cargo a.s. | | CZ | VKM |
| 99 | CDCA | C & D CARTAGE INC | | | SCAC3 |
| 100 | CDCB | CRANDALL CORPORATION | | | SCAC3 |
