| 1 | DC | Golden Air Flyg AB | ICAO: GAO, Callsign: Golden, Name changed to Braathens Regional AB. ICAO desigantor changed from GJZ | S | AVCODES |
| 2 | DC | Cypriair Tours Ltd. | | CY | AVCODES |
| 3 | DC | Caribbean Air Cargo | ICAO: DCC, Callsign: Caricargo, Designator DC recalled by IATA | BDS | AVCODES |
| 4 | DC | Braathens Regional Airways AB | ICAO: BRX, Callsign: Braathens, IATA designator changed to TF after merger with Braathens Regional Aviation AB on 18 March 2020. | S | AVCODES |
| 5 | DC | Air Georgia Ltd d/b/a Aircompany Air Georgia | ICAO: AGF, Callsign: Air Georgia, | GE | AVCODES |
| 6 | DC | Delray Connecting R.R. Co. | 8/1920-7/2005 | | NAKINA |
| 7 | DC | Delray Connecting R.R. Co. | 7/23-7/2000 | | NRHS |
| 8 | DC | DELRAY CONNECTING RAILROAD COMPANY | | | PWRC |
| 9 | DC | Delray Connecting Railroad | | | RSRV |
| 10 | DC | DELRAY CONNECTING RAILROAD COMPANY | | | SCAC4 |
| 11 | DCA | Aerodacia | Callsign: Aerodacia, | MD | AVCODES |
| 12 | DCA | Dreamcatcher Airways | Callsign: Dream Catcher, | GB | AVCODES |
| 13 | DCA | Aerotaxi del Caribe, S de R.L. de C.V. | Callsign: Delcaribe, | MEX | AVCODES |
| 14 | DCA | Dreamcatcher Airways | | | ICAO1 |
| 15 | DCA | DORSEY, CURTIS A | | | SCAC4 |
| 16 | DCAA | DCC TRANSPORT LLC | | | SCAC4 |
| 17 | DCAC | D & C TRUCKING OF COTTAGE GROVE LLC | | | SCAC4 |
| 18 | DCAE | DELANEY, CAROLINE | | | SCAC4 |
| 19 | DCAF | D C AIR FREIGHT DIVISION INC | | | SCAC4 |
| 20 | DCAI | DCA EXPRESS INC | | | SCAC4 |
| 21 | DCAM | DCA TRANSPORTE | | | SCAC4 |
| 22 | DCAR | DAKOTA CARTAGE COMPANY, INC | | | SCAC1 |
| 23 | DCAU | CACI | | F | BIC |
| 24 | DCAU | DIRECTION CENTRALE COMM ARMEE DE TE | | | SCAC4 |
| 25 | DCAX | Tarmac, Fla., Inc. | eliminated 7/1997; 7/2000-7/2005 (not listed) | | NAKINA |
| 26 | DCAX | Tarmac, Fla., Inc., c/o Delray Connecting R.R. Co. | added 10/1996 | | NAKINA |
| 27 | DCAX | Tarmac, Fla., Inc. | added 10/1989; 1/1994 | | NAKINA |
| 28 | DCAX | Tarmac, Fla., Inc. | added 10/89; 1/94 | | NRHS |
| 29 | DCAX | Tarmac, Fla., Inc., c/o Delray Connecting R.R. Co. | added 10/96 | | NRHS |
| 30 | DCAX | Tarmac, Fla., Inc. | eliminated 7/97; 7/2000 | | NRHS |
| 31 | DCAX | TARMAC FLA., INC. | | | PWRC |
| 32 | DCAX | Tarmac Florida | | | RSRV |
| 33 | DCAX | TARMAC FLA., INC. | | | SCAC4 |
| 34 | DCBG | DISTINGUISHED GENTLEMEN TRUCKING | | | SCAC4 |
| 35 | DCBL | DECAMP BUS LINES | | | SCAC4 |
| 36 | DCBN | DEMARK CUSTOMS BROKER INC | | | SCAC4 |
| 37 | DCBS | DAIMLER BUSES NORTH AMERICA LTD | | | SCAC4 |
| 38 | DCBT | DISCOVER BOOKS LTD | | | SCAC4 |
| 39 | DCBX | Degussa Engineered Carbons LP | added 4/2003; 7/2005 | | NAKINA |
| 40 | DCBX | Degussa Corp. | added 7/1991; 1/1994-7/2000; eliminated 4/2003 | | NAKINA |
| 41 | DCBX | Degussa Corp. | added 7/91; 1/94-7/2000 | | NRHS |
| 42 | DCBX | DEGUSSA ENGINEERED CARBONS, LLP [DEGUSSA CORP.] | | | PWRC |
| 43 | DCBX | DeGussa Engineered Carbons | | | RSRV |
| 44 | DCBX | DEGUSSA ENGINEERED CARBONS LP | | | SCAC4 |
| 45 | DCC | Caribbean Air Cargo | IATA: DC, Callsign: Caricargo, Designator DC recalled by IATA | BDS | AVCODES |
| 46 | DCC | Caribbean Air Cargo | | | ICAO1 |
| 47 | DCC | DUPONT CHEMICAL CO. | | | PWRC |
| 48 | DCCA | DAYCO CARRIERS | | | SCAC4 |
| 49 | DCCC | DRY CREEK CONSTRUCTION LLC | | | SCAC4 |
| 50 | DCCG | DAUDET CREEK CONTRACTING | | | SCAC4 |
| 51 | DCCI | D C CARRIERS INC | | | SCAC4 |
| 52 | DCCO | DENVER CONSOLIDATED CHASSIS POOL LL | | | SCAC4 |
| 53 | DCCP | DRAGON CREEK CARRIERS INC | | | SCAC4 |
| 54 | DCCT | DONGSUE CONSOL CO LTD | | | SCAC4 |
| 55 | DCCU | LAKE SUPERIOR WAREHOUSING | | USA | BIC |
| 56 | DCCU | DOW CORNING CORPORATION | | | PWRC |
| 57 | DCCU | Dow Corning Corporation | | | RSRV |
| 58 | DCCW | DEM CATTLE CO LP | | | SCAC4 |
| 59 | DCCX | McDonnell Douglas Corp. | added 10/1970; 1/1975-1/1980; eliminated 4/1989; added 4/1990; 1/1994-7/2005 (not listed) | | NAKINA |
| 60 | DCCX | Des Plaines Chemical Co. | 7/1965 (not listed); added 10/1966; 10/1966; eliminated 1/1969 | | NAKINA |
| 61 | DCCX | Davison Chemical Co., Division of W.R. Grace & Co. | added 1/1955; 10/1957; eliminated 4/1959 | | NAKINA |
| 62 | DCCX | Davison Chemical Corp. | 1/1941-4/1947 (not listed); 1/1950-7/1954; eliminated 1/1955 | | NAKINA |
| 63 | DCCX | The Davison Chemical Co. | 7/1923-7/1935; 7/1937-4/1938 (not listed) | | NAKINA |
| 64 | DCCX | Davison Chemical Corp. | Jan-52 | | NRHS |
| 65 | DCCX | Davison Chemical Co., Division of W.R. Grace & Co. | Oct-57 | | NRHS |
| 66 | DCCX | Des Plaines Chemical Co. | 7/65; added 10/66; 10/66; eliminated 1/69 | | NRHS |
| 67 | DCCX | McDonnell Douglas Corp. | added 10/70; 1/75-1/80; eliminated 4/89; added 4/90; 1/94-7/2000 | | NRHS |
| 68 | DCCX | MCDONNELL DOUGLAS CORPORATION [DES-PLAINES CHEMICAL CO.; DAVISON CHEMICAL CO. DIV. W.R. GRACE & CO.] | | | PWRC |
| 69 | DCCX | McDonnell Douglas Corporation | | | RSRV |
| 70 | DCCX | MCDONNELL DOUGLAS CORPORATION | | | SCAC4 |
| 71 | DCCZ | DECATUR COUNTY COOP. | | | PWRC |
| 72 | DCD | Air26 S.A. | Callsign: Ducard, | ANG | AVCODES |
| 73 | DCDA | DISTRIBUIDORA CENICIENTA DEL MAR SA | | | SCAC4 |
| 74 | DCDB | DECRESCENTE DISTRIBUTING CO INC | | | SCAC4 |
| 75 | DCDL | DANCO DISTRIBUTION LLC | | | SCAC4 |
| 76 | DCDM | DERGHAM C DERGHAM | | | SCAC4 |
| 77 | DCDT | D C D TRANSPORTATION INC | | | SCAC4 |
| 78 | DCE | Dutch Caribbean Airline N.V. | IATA: K8, Callsign: Dutch Caribbean, IATA Prefix: 559, | NA | AVCODES |
| 79 | DCE | Dutch Caribbean Express | | | ICAO1 |
| 80 | DCEC | DCE TRUCKING CORP | | | SCAC4 |
| 81 | DCED | D.C. EQUIPMENT LTD | | | SCAC4 |
| 82 | DCEG | DREAM CATCHER EXPEDITING | | | SCAC4 |
| 83 | DCEH | D C EXPRESS | | | SCAC4 |
| 84 | DCEJ | DEJONG, C E & SON TRANSPORT LLC | | | SCAC4 |
| 85 | DCEL | DODGE CITY EXPRESS LLC | | | SCAC4 |
| 86 | DCEM | D C EXPRESS LLC | | | SCAC4 |
| 87 | DCEO | DIAMOND CARGO EXPRESS LLC | | | SCAC4 |
| 88 | DCEP | D C EXPRESS INC | | | SCAC4 |
| 89 | DCET | DICE TRANSPORT INC | | | SCAC4 |
| 90 | DCEU | M/S DCM CONTAINERS & ENGINEERING PVT LTD | | IND | BIC |
| 91 | DCEU | ETABLISSEMENT CENTRAL DES ESSENCES | | | SCAC3 |
| 92 | DCEV | DICE VAN LINES INC | | | SCAC4 |
| 93 | DCF | DC Aviation Al-Futtaim LLC | Callsign: Desert Star, | UAE | AVCODES |
| 94 | DCF | Cardinal Airlines Limited | IATA: NN, Callsign: Cardinal Air, Designator NN recalled by IATA | AG | AVCODES |
| 95 | DCFB | Dodge City Ford & Bucklin R.R. Co., Inc. | 1/1994-7/2000 | | NAKINA |
| 96 | DCFB | Dodge City Ford & Bucklin R.R. Co., Inc. | 1/94-7/2000 | | NRHS |
| 97 | DCFB | DODGE CITY FORD & BUCKLIN RAILROAD CO., INC. | | | PWRC |
| 98 | DCFD | DUKE CITY FOOD LOGISTICS | | | SCAC4 |
| 99 | DCFI | D C F AND B INC | | | SCAC4 |
| 100 | DCFP | DESSERT CRAFT FOOD PRODUCTS | | | SCAC4 |
