| 3001 | DLNW | Denver, Laramie and North Western Railroad (Great Western Railway of Colorado) | | | RSRV |
| 3002 | DLO | Nauta | Callsign: Nauta, | I | AVCODES |
| 3003 | DLOB | DELUXE LOGISTICS | | | SCAC4 |
| 3004 | DLOD | DELIVERY LOGISTICS | | | SCAC4 |
| 3005 | DLOE | DNW LOGISTICS | | | SCAC4 |
| 3006 | DLOG | DELIVERY LOGISTICS | | | SCAC4 |
| 3007 | DLOI | DALTON INC | | | SCAC4 |
| 3008 | DLOO | DYNO LOGISTICS | | | SCAC4 |
| 3009 | DLOQ | DCL LOGISTICS | | | SCAC4 |
| 3010 | DLOT | DLC TRANSPORT | | | SCAC4 |
| 3011 | DLOV | DELTA LOGISITICS | | | SCAC4 |
| 3012 | DLOX | Dominion Linseed Oil Co., Ltd. | 7/1937-1/1952; reporting mark eliminated 4/1953 | | NAKINA |
| 3013 | DLOX | Dominion Linseed Oil Co., Ltd. | 4/38-1/52 | | NRHS |
| 3014 | DLOX | DOMINION LINSEED OIL CO., LTD. | | | PWRC |
| 3015 | DLOY | DYASA LOGISTICS | | | SCAC4 |
| 3016 | DLP | Graf Und Maresch GmbH | Callsign: Delphinair, | D | AVCODES |
| 3017 | DLPC | DOLPHIN CARTAGE INC | | | SCAC4 |
| 3018 | DLPD | DAHNAY LOGISTICS PVT LTD | | | SCAC4 |
| 3019 | DLPE | D & L PERFORMANCE INC | | | SCAC4 |
| 3020 | DLPH | DELPHINA TANKER CORPORATION | | | SCAC4 |
| 3021 | DLPJ | DE LA PENA, JOSE MANUEL | | | SCAC4 |
| 3022 | DLPL | DOLPHIN LINE INC | | | SCAC4 |
| 3023 | DLPN | DAILY PRINTING INC | | | SCAC4 |
| 3024 | DLPX | Degussa Canada Ltd. | 7/2000-7/2005 | | NAKINA |
| 3025 | DLPX | Degussa Canada Ltd. | Jul-00 | | NRHS |
| 3026 | DLPX | DEGUSSA CANADA, LTD. | | | PWRC |
| 3027 | DLPX | DeGussa Canada | | | RSRV |
| 3028 | DLPX | DEGUSSA CANADA LTD | | | SCAC4 |
| 3029 | DLQC | DIRECT LOGISTICS INC | | | SCAC4 |
| 3030 | DLQM | DALMARE S P A | | | SCAC4 |
| 3031 | DLR | Dala Air Services Ltd. | Callsign: Dala Air, | WAN | AVCODES |
| 3032 | DLR | Dala Air Services | | | ICAO1 |
| 3033 | DLRB | DULCERIA LA REGIA | | | SCAC4 |
| 3034 | DLRC | DELAWARE RIVER COACH LINES INC | | | SCAC4 |
| 3035 | DLRE | DULAY ROAD CARRIERS | | | SCAC4 |
| 3036 | DLRH | DE LA ROSA, LUIS CHB INC | | | SCAC4 |
| 3037 | DLRJ | DE LA ROSA, GERMAN | | | SCAC4 |
| 3038 | DLRL | DLR FREIGHT INC | | | SCAC4 |
| 3039 | DLRN | DE LUNA RODRIGUEZ, JUAN JAIME | | | SCAC4 |
| 3040 | DLRQ | DE LA ROSA TRUCKING | | | SCAC4 |
| 3041 | DLRR | DE LOS RIOS RUBIO TRANSPORTES | | | SCAC4 |
| 3042 | DLRS | DEALER SUPPLIES | | | SCAC4 |
| 3043 | DLRT | DANIELS, RICHARD TRANSPORTATION INC | | | SCAC4 |
| 3044 | DLRU | DELO LTD. | | RUS | BIC |
| 3045 | DLRV | DE LA ROSA, SILVIA | | | SCAC4 |
| 3046 | DLRX | General Electric Rail Services Corp. | added 1/2000; 7/2000-7/2005 | | NAKINA |
| 3047 | DLRX | General Electric Railcar Services Corp. | added 1/1984; 1/1994; eliminated 1/2000 | | NAKINA |
| 3048 | DLRX | North American Car Corp. | added 7/1956; 10/1957-1/1980; eliminated 1/1984 | | NAKINA |
| 3049 | DLRX | North American Car Corp. | added 7/56; 10/57-1/80 | | NRHS |
| 3050 | DLRX | General Electric Railcar Services Corp. | 1/94; eliminated 1/2000 | | NRHS |
| 3051 | DLRX | General Electric Rail Services Corp. | added 1/2000; 7/2000 | | NRHS |
| 3052 | DLRX | *DISNEY LAND RAILROAD | | | PWRC |
| 3053 | DLRX | +(NATX) G.E. RAIL SERVICES [NORTH AMERICAN CAR CORP] | | | PWRC |
| 3054 | DLRX | GE Railcar Services Corporation | | | RSRV |
| 3055 | DLRX | GENERAL ELECTRIC RAILCAR SERVICES C | | | SCAC4 |
| 3056 | DLRX | General Electric Rail Services Corp. | | USA | TRAFFIC |
| 3057 | DLRY | DEL REY EXPRESS | | | SCAC4 |
| 3058 | DLS | Aero Modelo, S.A. de C.V. | Callsign: Aeromodelo, | MEX | AVCODES |
| 3059 | DLS | Aero Modelo | | | ICAO1 |
| 3060 | DLS | DAVES LIMOUSINE SERVICE | | | SCAC4 |
| 3061 | DLSA | D & L DOUBLECUT SAWMILLS LTD | | | SCAC4 |
| 3062 | DLSB | DISTRIBUTION & LOGISTIC SOLUTIONS S | | | SCAC4 |
| 3063 | DLSG | DLS LOGISTICS INC | | | SCAC4 |
| 3064 | DLSJ | DLS LOGISTIC SERVICE LLC | | | SCAC4 |
| 3065 | DLSK | Deutsche Leasing Slovakia spol. s r.o. | | SK | VKM |
| 3066 | DLSL | DISTRIBUTION LOGISTIC SERVICES INC | | | SCAC4 |
| 3067 | DLSM | DANIELSON | | | SCAC4 |
| 3068 | DLSN | DEDICATED LOGISTICS SERVICES INC | | | SCAC4 |
| 3069 | DLSO | DLS TRANSPORT INC | | | SCAC4 |
| 3070 | DLSP | DIRECT LANDSCAPE SUPPLY | | | SCAC4 |
| 3071 | DLSU | DELTA SERVICE LOCATION | | F | BIC |
| 3072 | DLSX | Diesel Supply Co. Inc. | 7/2000-7/2005 (not listed) | | NAKINA |
| 3073 | DLSX | Diesel Supply Co. Inc. | Jul-00 | | NRHS |
| 3074 | DLSX | DIESEL SUPPLY COMPANY INC | | | PWRC |
| 3075 | DLSX | Diesel Supply | | | RSRV |
| 3076 | DLSX | DIESEL SUPPLY COMPANY INC | | | SCAC4 |
| 3077 | DLSY | D & L SUPPLY COMPANY | | | SCAC4 |
| 3078 | DLT | DLT Luftverkehrsgesellschaft mbH | IATA: DW, Callsign: DLT, | D | AVCODES |
| 3079 | DLT | Dat Lite | Callsign: Datlite, Ceased operations. | LT | AVCODES |
| 3080 | DLTB | DELANES TRUCK BROKERAGE INC | | | SCAC4 |
| 3081 | DLTC | DOUBLE L TRUCKING & LIVESTOCK LLC | | | SCAC4 |
| 3082 | DLTD | DELTA INDUSTRIAL SERVICES | | | SCAC4 |
| 3083 | DLTE | DALTON ENTERPRISES INC | | | SCAC4 |
| 3084 | DLTF | DELTA FUEL COMPANY INC | | | SCAC4 |
| 3085 | DLTI | DE LOPEZ TRUCKING LLC | | | SCAC4 |
| 3086 | DLTJ | DEL TRANSPORT LLC | | | SCAC4 |
| 3087 | DLTK | DALTON TRUCKING INC | | | SCAC4 |
| 3088 | DLTM | D L TERMINALS INC | | | SCAC4 |
| 3089 | DLTP | DELTA TRANSPORT INC | | | SCAC4 |
| 3090 | DLTQ | DAVIDSON LOG & TIMBER ARTISANS | | | SCAC4 |
| 3091 | DLTU | DALREFTRANS LTD | | RUS | BIC |
| 3092 | DLTU | DALREFTRANS LTD | | | SCAC4 |
| 3093 | DLTX | Dale L. Thornborough | 1/1980; added 7/1980; eliminated 10/1990; 1/1994-7/2005 (not listed) | | NAKINA |
| 3094 | DLTX | Dale L. Thornborough | 1/80; added 7/80; eliminated 10/90; 1/94-7/2000 | | NRHS |
| 3095 | DLTX | DALE L. THORNBOROUGH | | | PWRC |
| 3096 | DLTX | Dale L. Thornborough | | | RSRV |
| 3097 | DLTX | DALE L. THORNBOROUGH | | | SCAC4 |
| 3098 | DLTY | DALTON OIL COMPANY | | | SCAC4 |
| 3099 | DLU | AirComet Chile | IATA: 3I, Callsign: Bluecomet, Founded on 06 December 2004 as Southern Airlines. Ceased operations on 31 October 2008 and filled for bankruptcy protection on 18/12/2008. Name changed to Air Comet Chile in September 2007. | RCH | AVCODES |
| 3100 | DLU | Aerolineas Del Sur | | | ICAO1 |
