| 1001 | DCLY | DIMITRE CARGO LINES INC | | | SCAC4 |
| 1002 | DCLZ | DERBY CITY LUMBER CO. | | | PWRC |
| 1003 | DCLZ | MAERSK EQUIPMENT SERVICE COMPANY | | | SCAC4 |
| 1004 | DCM | Fltplan, LLC | Callsign: Dot Com, | USA | AVCODES |
| 1005 | DCM | FLTPLAN | | | ICAO1 |
| 1006 | DCME | DCM EXPRESS LLC | | | SCAC4 |
| 1007 | DCMG | DISTINCTION CARGO MANAGEMENT INC | | | SCAC4 |
| 1008 | DCMK | DURHAM CUSTOM MILLWORK | | | SCAC4 |
| 1009 | DCMO | DUKES, C M OIL CO | | | SCAC4 |
| 1010 | DCMP | DOCMASTER TRANSPORT LLC | | | SCAC4 |
| 1011 | DCMT | DCM TRANSPORT INC | | | SCAC4 |
| 1012 | DCMU | MINISTERE DES ARMEES - SIMMT | | F | BIC |
| 1013 | DCMU | DIR CENTRALE DU MATERIEL DE LARMEE | | | SCAC4 |
| 1014 | DCMV | DAWSON CREEK MOVING & STORAGE LTD | | | SCAC4 |
| 1015 | DCMX | Davidson Construction Materials, Inc. | added 4/1982; eliminated 4/1989 | | NAKINA |
| 1016 | DCMX | Delta Chemical & Iron Co. | 7/1923-1/1943 | | NAKINA |
| 1017 | DCMX | Delta Chemical Co. | 8/1920 | | NAKINA |
| 1018 | DCMX | Delta Chemical & Iron Co. | Apr-38 | | NRHS |
| 1019 | DCMX | Davidson Construction Materials, Inc. | added 4/82; eliminated 4/89 | | NRHS |
| 1020 | DCMX | *DELTA CHEMICAL & IRON CO. | | | PWRC |
| 1021 | DCMX | *DAVIDSON CONSTRUCTION MATERIALS INC. | | | PWRC |
| 1022 | DCMX | Davidson Construction Materials | | | RSRV |
| 1023 | DCN | Federal Armed Forces, Federal Republic of Germany | Callsign: Diplomatic Clearance, | D | AVCODES |
| 1024 | DCN | Federal Armed Forces | | | ICAO1 |
| 1025 | DCNE | DIRECT CONNECTION | | | SCAC4 |
| 1026 | DCNG | D & C TRUCKING INC | | | SCAC4 |
| 1027 | DCNO | DUNCAN, J H OIL INC | | | SCAC4 |
| 1028 | DCNR | DUCAN INDUSTRIES INC | | | SCAC4 |
| 1029 | DCNU | EDF DCN | | F | BIC |
| 1030 | DCO | David Crawshaw Consultants Ltd. | | GB | AVCODES |
| 1031 | DCO | Distribuidora Y Comercializadora Jaz, S.A. de C.V. | Callsign: Aerojaz, | MEX | AVCODES |
| 1032 | DCO | David Crawshaw Consultants Limited | | | ICAO1 |
| 1033 | DCO | DIPERT, DAN COACHES | | | SCAC4 |
| 1034 | DCOA | DURATRANS CORPORATION | | | SCAC4 |
| 1035 | DCOB | DESCON CORPORATION | | | SCAC4 |
| 1036 | DCOC | DUNCAN OIL COMPANY INC | | | SCAC4 |
| 1037 | DCOG | DKST COMPUTERS | | | SCAC4 |
| 1038 | DCOI | DIVERSIFIED CONTROL INC | | | SCAC4 |
| 1039 | DCOM | DATAVISION COMPUTER | | | SCAC4 |
| 1040 | DCON | Detroit Connecting Railroad Co. | added 1/2004; eliminated 4/2004; 7/2005 | | NAKINA |
| 1041 | DCON | DETROIT CONNECTING RAILROAD CO. | | | PWRC |
| 1042 | DCON | Detroit Connecting Railroad | | | RSRV |
| 1043 | DCON | DETROIT CONNECTING RAILROAD COMPANY | | | SCAC4 |
| 1044 | DCOQ | DAYS CORPORATION | | | SCAC4 |
| 1045 | DCOU | DOW SILICONES UK LIMITED | | GB | BIC |
| 1046 | DCOU | DOW CORNING CORPORATION | | | PWRC |
| 1047 | DCOU | Dow Corning Corporation | | | RSRV |
| 1048 | DCOU | DOW CORNING LIMITED | | | SCAC4 |
| 1049 | DCOZ | DOVER COOP | | | PWRC |
| 1050 | DCP | Delta Connection Limited | IATA: DQ, IATA Prefix: 521, Name changed to Air Direct Connect Limited. | EAK | AVCODES |
| 1051 | DCPC | DIVERSIFIED CPC INTERNATIONAL INC | | | SCAC4 |
| 1052 | DCPG | DALLAS CITY PACKING INC | | | SCAC4 |
| 1053 | DCPI | DCP TRUCKING INC | | | SCAC4 |
| 1054 | DCPN | D C P TRANSPORT | | | SCAC4 |
| 1055 | DCPR | DELAPS COVE FISH PRODUCTS LTD | | | SCAC4 |
| 1056 | DCPS | DCP SERVICES LTD | | | SCAC4 |
| 1057 | DCPX | Dart Container Corp. of Pennsylvania | 1/1975; added 4/1975; 1/1980-1/1994; eliminated 4/2000; 7/2000-7/2005 (not listed) | | NAKINA |
| 1058 | DCPX | Dacar Chemical Products Co. | 1/1952-7/1965; eliminated 7/1966 | | NAKINA |
| 1059 | DCPX | De Soto Creamery & Produce Co. (North Western Refrigerator Line Co.) | 7/1935 | | NAKINA |
| 1060 | DCPX | Dacar Chemical Products Co. | 1/52-7/65; eliminated 7/66 | | NRHS |
| 1061 | DCPX | Dart Container Corp. of Pennsylvania | 1/75; added 4/75; 1/80-1/94; eliminated 4/2000; 7/2000 | | NRHS |
| 1062 | DCPX | *DACAR CHEMICAL PRODUCTS CO. | | | PWRC |
| 1063 | DCPX | +DART CONTAINER CORP | | | PWRC |
| 1064 | DCPX | Dart Container Corporation of Pennsylvania | | | RSRV |
| 1065 | DCPX | DART CONTAINER CORP | | | SCAC4 |
| 1066 | DCR | Discovery Ltd | Callsign: Disco, | UA | AVCODES |
| 1067 | DCR | Devon & Cornwall Railways Limited | | GB | TRAFFIC |
| 1068 | DCRC | DECORACION COLONIAL S A | | | SCAC4 |
| 1069 | DCRG | DRIFTWOOD CROSSING | | | SCAC4 |
| 1070 | DCRH | DIAMOND C RANCH LIMOUSIN | | | SCAC4 |
| 1071 | DCRI | DANIEL CARRIER INC | | | SCAC4 |
| 1072 | DCRK | DOVECREEK DE MEXICO SA DE CV | | | SCAC4 |
| 1073 | DCRL | DISNEY CRUISE LINE | | | SCAC4 |
| 1074 | DCRN | D/C TRANSPORT INC | | | SCAC4 |
| 1075 | DCRQ | DCR EXPRESS INC | | | SCAC4 |
| 1076 | DCRR | Dubois County R.R. | 1/1994-7/2005 | | NAKINA |
| 1077 | DCRR | Dubois County R.R. | 1/94-7/2000 | | NRHS |
| 1078 | DCRR | DUBOIS COUNTY RAILROAD | | | PWRC |
| 1079 | DCRR | Dubois County Railroad | | | RSRV |
| 1080 | DCRR | DUBOIS COUNTY RAILROAD | | | SCAC4 |
| 1081 | DCRT | DCR TRUCKING INC | | | SCAC4 |
| 1082 | DCRX | DEADWOOD CENTRAL RAILROAD COMPANY | | | PWRC |
| 1083 | DCRY | DCR TRUCKING INC | | | SCAC4 |
| 1084 | DCS | Daimler Chrysler Aviation GmbH | Callsign: Twin Star, Name changed to DC Aviation GmbH | D | AVCODES |
| 1085 | DCS | DC Aviation GmbH | Callsign: Twin Star, Name changed from Daimler Chrysler Aviation GmbH | D | AVCODES |
| 1086 | DCS | Daimler Chrysler Aviation | | | ICAO1 |
| 1087 | DCSA | DORSCH, CHARLES SHIPS AGENT INC | | | SCAC4 |
| 1088 | DCSD | DEL CORONA SCARDIGLI | | | SCAC4 |
| 1089 | DCSE | DEL-CO TRANSPORT SERVICES, INC | | | SCAC1 |
| 1090 | DCSG | DONS COLD STORAGE AND TRANSPORTATIO | | | SCAC4 |
| 1091 | DCSH | DIAMOND CONCRETE SUPPLY INC | | | SCAC4 |
| 1092 | DCSI | DELSMAN, C & SONS INC | | | SCAC4 |
| 1093 | DCSK | D & C SERVICES | | | SCAC4 |
| 1094 | DCSM | DELTA COMMANDER SPECIAL MARITIME EN | | | SCAC4 |
| 1095 | DCSN | DOUBLE C SERVICES INC | | | SCAC4 |
| 1096 | DCSO | DASH COURIER SERVICE | | | SCAC4 |
| 1097 | DCSQ | DEDICATED CONTAINER SOLUTIONS INC | | | SCAC4 |
| 1098 | DCST | DELACO STEEL CORPORATION | | | SCAC4 |
| 1099 | DCSU | DANISH CONTAINER SUPPLY | | DK | BIC |
| 1100 | DCSU | DELTA CONTENEUR SERVICE | | | PWRC |
