| 1 | DL | Delta Air Lines, Inc. | ICAO: DAL, Callsign: Delta, IATA Prefix: 006, | USA | AVCODES |
| 2 | DL | Delaware-Lackawanna R.R. Co., Inc. | added 1/1994; 7/2000-7/2005; eliminated 1/2010 | | NAKINA |
| 3 | DL | Delaware-Lackawanna R.R. Co., Inc. | added 1/94; 7/2000 | | NRHS |
| 4 | DL | DELAWARE-LACKAWANNA RAILROAD COMPANY, INC. | | | PWRC |
| 5 | DL | Delaware Lackawanna | | | RSRV |
| 6 | DL | DELAWARE-LACKAWA | | | SCAC4 |
| 7 | DL | Delaware-Lackawanna Railroad Company | | USA | TRAFFIC |
| 8 | DL&W | Consolidated Rail Corp. | added 4/1976 | | NAKINA |
| 9 | DL&W | Erie Lackawanna Ry. Co., Thomas J. Patton and Ralph S. Tyler, Jr., Trustees | eliminated 4/1976 | | NAKINA |
| 10 | DL&W | Erie Lackawanna R.R. Co. (Delaware, Lackawanna & Western R.R. Co.) | 10/1966 | | NAKINA |
| 11 | DL&W | (The) Delaware, Lackawanna & Western R.R. (Co.) | 8/1920-7/1965 | | NAKINA |
| 12 | DL&W | The Delaware, Lackawanna & Western R.R. Co. | 23-Jul | | NRHS |
| 13 | DL&W | Delaware, Lackawanna & Western R.R. | 4/38-7/65 | | NRHS |
| 14 | DL&W | Erie Lackawanna R.R. Co. (Delaware, Lackawanna & Western R.R. Co.) | Oct-66 | | NRHS |
| 15 | DL&W | Erie Lackawanna Ry. Co., Thomas J. Patton and Ralph S. Tyler, Jr., Trustees | eliminated 4/76 | | NRHS |
| 16 | DL&W | Consolidated Rail Corp. | added 4/76 | | NRHS |
| 17 | DL&W | CONRAIL CORP. [ERIE LACKAWANNA RAILROAD CO.; DELAWARE, LACKAWANA & WESTERN RR] | | | PWRC |
| 18 | DLA | Air Dolomiti S.p.A. Linee Aeree Regionali Europee | IATA: EN, Callsign: Dolomiti, IATA Prefix: 101, Name changed from Air Dolomiti S.p.A. | I | AVCODES |
| 19 | DLA | Air Dolomiti | IATA: EN | | ICAO1 |
| 20 | DLA | DOLNOŚLASKIE LINIE AUTOBUSOWE Sp.z o.o. | | PL | VKM |
| 21 | DLAF | DELCO FREIGHT SYSTEMS, INC | | | SCAC1 |
| 22 | DLAG | DE LAURA, MICHAEL | | | SCAC4 |
| 23 | DLAJ | DALLAS MOVING & STORAGE INC | | | SCAC4 |
| 24 | DLAK | DURADO, L TRUCKING LLC | | | SCAC4 |
| 25 | DLAL | D & L CONSTRUCTION CO INC | | | SCAC4 |
| 26 | DLAP | DUNLAP FARMS TRUCKING LLC | | | SCAC4 |
| 27 | DLAR | DIVERSE LOGISTICS AND TRANSPORTATIO | | | SCAC4 |
| 28 | DLAS | D & L TRUCKING | | | SCAC4 |
| 29 | DLAT | DLA TRUCKING | | | SCAC4 |
| 30 | DLAU | DENTOON BV | | NL | BIC |
| 31 | DLAW | Dolnośląskie Linie Autobusowe | | PL | TRAFFIC |
| 32 | DLAY | DULAYS, B N TRUX | | | SCAC4 |
| 33 | DLB | Chattanooga Jet Centre | Callsign: Chattanooga, ICAO Designator changed to JGF | USA | AVCODES |
| 34 | DLB | Destination Airlink Bahamas Ltd | IATA: AL, Callsign: Airlink Bahamas, | BS | AVCODES |
| 35 | DLBC | DELTA LOGISTICS SERVICE LTD | | | SCAC4 |
| 36 | DLBE | DLB BULK LOGISTIC SERVICES | | | SCAC4 |
| 37 | DLBG | D L LOGISTICS LLC | | | SCAC4 |
| 38 | DLBI | DOUBLE L TRANSPORT INC | | | SCAC4 |
| 39 | DLBJ | DEL BAJIO TRANSPORT | | | SCAC4 |
| 40 | DLBK | DELTA BULK TRANSPORT | | | SCAC4 |
| 41 | DLBL | DANNYS LIVE BAIT LTD | | | SCAC4 |
| 42 | DLBM | DEBOER LOGISTICS LLC | | | SCAC4 |
| 43 | DLBN | DRIVE LINE TRANSPORTATION INC | | | SCAC4 |
| 44 | DLBO | DEPLOYED LOGISTICS INC | | | SCAC4 |
| 45 | DLBP | DAY LUMBER AND PALLET LLC | | | SCAC4 |
| 46 | DLBR | DALTON BROTHERS TRUCKING | | | SCAC4 |
| 47 | DLBS | DURKEE LOBSTER BAIT CO | | | SCAC4 |
| 48 | DLBV | DIVERSE LOGISTICS AND TRANSPORTATIO | | | SCAC4 |
| 49 | DLC | Ruili Jingcheng Helicopters Co., Ltd. | Callsign: Soarcopter, | PRC | AVCODES |
| 50 | DLC | Drummond Lighterage | 1/1975-7/2005 | | NAKINA |
| 51 | DLC | Drummond Lighterage | 1/75-7/2000 | | NRHS |
| 52 | DLC | Dillen & Le Jeune Cargo NV | Antwerpen | D | privat-bahn.de |
| 53 | DLC | *DUQUESNE LIGHT CO. | | | PWRC |
| 54 | DLC | +DRUMMOND LIGHTERAGE | | | PWRC |
| 55 | DLC | Drummond Lighterage | | | RSRV |
| 56 | DLC | Dampflokiclub Herisau | | CH | VKM |
| 57 | DLCC | D & L CARGO INC | | | SCAC4 |
| 58 | DLCD | DOMINO LOGISTICS CO | | | SCAC4 |
| 59 | DLCI | DELCO TRANSPORT INC | | | SCAC4 |
| 60 | DLCK | DOLECKI TRANSPORT | | | SCAC4 |
| 61 | DLCM | DELONG COMPANY INC, THE | | | SCAC4 |
| 62 | DLCN | D AND L CARRIERS INC | | | SCAC4 |
| 63 | DLCP | DELTA LOGISTICS TRANSPORTATION INC | | | SCAC4 |
| 64 | DLCR | DELAWARE COAST LINE RAILROAD | | | PWRC |
| 65 | DLCR | Delaware Coast Line Railroad | | | RSRV |
| 66 | DLCR | D L C TRANSPORT INC | | | SCAC4 |
| 67 | DLCS | DOLEC CONSULTANTS INC | | | SCAC4 |
| 68 | DLCT | DELCO ENTERPRISES LTD | | | SCAC4 |
| 69 | DLCX | Dearborn Leasing Co. | added 7/1964; 7/1965-1/1980; eliminated 7/1982 | | NAKINA |
| 70 | DLCX | David Levi & Co. | 7/1932-4/1938 | | NAKINA |
| 71 | DLCX | David Levi & Co. (Mather Stock Car Co.) | Apr-38 | | NRHS |
| 72 | DLCX | Dearborn Leasing Co. | added 7/64; 7/65-1/80; eliminated 7/82 | | NRHS |
| 73 | DLCX | *DAVID LEVI & CO. | | | PWRC |
| 74 | DLCX | *DEARBORN LEASING CO. | | | PWRC |
| 75 | DLCX | *WASTE MANAGEMENT, INC. | | | PWRC |
| 76 | DLCX | Dearborn Leasing Co. (Waste Management) | | | RSRV |
| 77 | DLCX | DIESEL LOCOMOTIVE CO LLC | | | SCAC4 |
| 78 | DLCY | DERSTINE LEASING COMPANY | | | SCAC4 |
| 79 | DLDA | DELGADO SA | | | SCAC4 |
| 80 | DLDE | DOLPHIN DELIVERY LTD | | | SCAC4 |
| 81 | DLDK | DONALDSON TRUCKING | | | SCAC4 |
| 82 | DLDL | DLD LOGISTICS INC | | | SCAC4 |
| 83 | DLDN | DA-LEE DUST CONTROL | | | SCAC4 |
| 84 | DLDS | DIAMOND LINE DELIVERY SYSTEMS INC | | | SCAC4 |
| 85 | DLDW | DOORLAND 2000 INC | | | SCAC4 |
| 86 | DLDX | Asphalt Products & Consulting, Inc. | added 7/2005; 7/2005 | | NAKINA |
| 87 | DLDX | Dow Chemical Co., Ludington Division | added 1/1956; 10/1957-7/1965; eliminated 1/1966 | | NAKINA |
| 88 | DLDX | Dow Chemical Co., Ludington Division | 10/57-7/65; eliminated 1/66 | | NRHS |
| 89 | DLDX | *DOW CHEMICAL CO., LUDINGTON DIV. | | | PWRC |
| 90 | DLDX | +ASPHALT PRODUCTS & CONSULTING, INC. | | | PWRC |
| 91 | DLDX | ASPHALT PRODUCTS & CONSULTING INC | | | SCAC4 |
| 92 | DLED | DELMED | | | SCAC4 |
| 93 | DLEI | DELIVER EASE INC | | | SCAC4 |
| 94 | DLEI | Die Lei GmbH | | D | TRAFFIC |
| 95 | DLEK | DEN-LEE TRUCKING LTD | | | SCAC4 |
| 96 | DLEL | DIAMOND LOGISTICS EXPRESS INC | | | SCAC4 |
| 97 | DLEM | DUARTE TRUCKING | | | SCAC4 |
| 98 | DLEO | DE LEON PADILLA, FELIX | | | SCAC4 |
| 99 | DLEQ | DIRECT LINE ENVIRONMENTAL CORP | | | SCAC4 |
| 100 | DLET | D & L EQUIPMENT INC | | | SCAC4 |
