| 201 | DAFX | Department of the Army, Office of the Chief of Transportation | Oct-57 | | NRHS |
| 202 | DAFX | Department of the Army | eliminated 7/58 | | NRHS |
| 203 | DAFX | Dept. of Defense, Military Traffic Management and Terminal Service | added 10/66; 10/66-4/70; eliminated 1/74 | | NRHS |
| 204 | DAFX | Dept. of Defense, Military Traffic Management Command | Jan-75 | | NRHS |
| 205 | DAFX | Dept. of Defense, Troop Support and Aviation Material Readiness Command (intra-plant service) | 1/80-1/94 | | NRHS |
| 206 | DAFX | Dept. of Defense | added 4/94; eliminated 7/94 | | NRHS |
| 207 | DAFX | Dept. of Defense, MTMC | eliminated 4/95 | | NRHS |
| 208 | DAFX | Dept. of Defense, Troop Support and Aviation Material Readiness Command (intra-plant service) | Jul-00 | | NRHS |
| 209 | DAFX | DEPT. OF DEFENSE (DEPT. OF ARMY, TROOP SUPPORT & AVIATION MATL. READINESS) | | | PWRC |
| 210 | DAFX | United States Department of Defense - Army | | | RSRV |
| 211 | DAFX | DEPT OF ARMY MIL TRFC MGMT & TERM S | | | SCAC4 |
| 212 | DAFZ | *DAFRA LINES SA | | | PWRC |
| 213 | DAFZ | *DAWN FOODS | | | PWRC |
| 214 | DAFZ | Dafra Lines | | | RSRV |
| 215 | DAFZ | DAFRA LINES SA | | | SCAC4 |
| 216 | DAG | Federal State Unitary Enterprise Daghestan Airlines | IATA: N2, Callsign: Dagal, IATA Prefix: 394, | RUS | AVCODES |
| 217 | DAG | Dagestan Airlines | IATA: N2 | | ICAO1 |
| 218 | DAG | DAGUSCAHONDA RR | | | PWRC |
| 219 | DAGG | DAGGETT TRUCK LINE, INC | | | SCAC4 |
| 220 | DAGK | D A G TRUCKING ENT INC | | | SCAC4 |
| 221 | DAGL | DELD AGRO LTD | | | SCAC4 |
| 222 | DAGM | D & A TRANSPORT | | | SCAC4 |
| 223 | DAGN | D A G TRUCKING OF WI LLC | | | SCAC4 |
| 224 | DAGO | DURYEA, GEORGE | | | SCAC4 |
| 225 | DAGR | DANIELS, G R TRUCKING INC | | | SCAC4 |
| 226 | DAGU | STE DANGEXPRESS | | | SCAC4 |
| 227 | DAGW | D A G TRKG OF WI LLC | | | SCAC4 |
| 228 | DAGY | DIX AGENCY | | | SCAC4 |
| 229 | DAH | Air Algerie | IATA: AH, Callsign: Air Algerie, IATA Prefix: 124, | DZ | AVCODES |
| 230 | DAH | Air Algérie | IATA: AH | | ICAO1 |
| 231 | DAHER | Daher Projects GmbH | Real: NCS | D | TRAFFIC |
| 232 | DAHM | DAHL, MARK | | | SCAC4 |
| 233 | DAHM | | City: Dahmetal | D | TRAFFIC |
| 234 | DAHU | DAHNAY LOGISTICS PRIVATE LIMITED | | IND | BIC |
| 235 | DAHU | Dahlson Industries | | | RSRV |
| 236 | DAHU | DAHLSON INDUSTRIES LTD | | | SCAC4 |
| 237 | DAI | Denair Aviation Limited | Callsign: Denair, | GB | AVCODES |
| 238 | DAI | Dena Airways | IATA: D9, Callsign: Dena, IATA Prefix: 313, | IR | AVCODES |
| 239 | DAIA | DESERT AIR ALASKA | | | SCAC4 |
| 240 | DAIB | DSJ ACQUISITIONS INC | | | SCAC4 |
| 241 | DAIC | DAILY EXPRESS, INC. | | | SCAC1 |
| 242 | DAIC | DAILY EXPRESS, INC | | | SCAC4 |
| 243 | DAIH | Daihatsu | | ROK | TRAFFIC |
| 244 | DAIM | DAIM LOGISTICS INC | | | SCAC4 |
| 245 | DAIN | DAIN INDUSTRIES | | | SCAC4 |
| 246 | DAIO | DAL SOGLIO INC | | | SCAC4 |
| 247 | DAIP | DIRECT AIR INC | | | SCAC4 |
| 248 | DAIQ | DSJ ACQUISITIONS INC | | | SCAC4 |
| 249 | DAIR | D&I R.R. Co. | added 7/1982; 1/1994-7/2005 | | NAKINA |
| 250 | DAIR | D&I R.R. Co. | added 7/82; 1/94-7/2000 | | NRHS |
| 251 | DAIR | D & I RAILROAD CO. | | | PWRC |
| 252 | DAIR | D&I Railroad | | | RSRV |
| 253 | DAIR | Dakota & Iowa Railroad Co. | | USA | TRAFFIC |
| 254 | DAIS | DISTRIBUTION AIR & TRANSPORTATION S | | | SCAC4 |
| 255 | DAIU | DAIKIN INDUSTRIES, LTD | | J | BIC |
| 256 | DAIU | DAIKIN INDUSTRIES LTD | | | SCAC4 |
| 257 | DAIX | Mt. Vernon Car Manufacturing Co. | 7/1935-7/1937; 4/1938-4/1961 (not listed) | | NAKINA |
| 258 | DAIX | Mt. Vernon Car Manufacturing Co. | 1/52-4/61 | | NRHS |
| 259 | DAIX | MT. VERNON CAR MANUFACTURING CO. | | | PWRC |
| 260 | DAIY | DAIRY TECH SALES | | | SCAC4 |
| 261 | DAJ | Jet A Co., Ltd. | Callsign: Stratus, | T | AVCODES |
| 262 | DAJS | D AND J LOGISTICS | | | SCAC4 |
| 263 | DAJT | DAJ TRANSPORTATION SERVICES LLC | | | SCAC4 |
| 264 | DAK | Dakair SA | Callsign: Dakairline, | F | AVCODES |
| 265 | DAK | First Flying | | J | TRAFFIC |
| 266 | DAKC | DCT | | | SCAC4 |
| 267 | DAKD | DAKOTALAND TRANSPORTATION INC | | | SCAC4 |
| 268 | DAKE | D & A TRUCKING LLC | | | SCAC4 |
| 269 | DAKJ | DELTA TRUCKING SERVICE INC | | | SCAC4 |
| 270 | DAKL | DAKOTA LOADS INC | | | SCAC4 |
| 271 | DAKN | DAK TRUCKING LLC | | | SCAC4 |
| 272 | DAKQ | D & K LOGISTICS | | | SCAC4 |
| 273 | DAKR | Dakota Rail Inc. | added 7/1982; eliminated 1/1989; 1/1994-7/2000; eliminated 10/2000; 7/2005 | | NAKINA |
| 274 | DAKR | Dakota Rail Inc. | added 7/82; eliminated 1/89; 1/94-7/2000; eliminated 10/2000 | | NRHS |
| 275 | DAKR | DAKOTA RAIL INC | | | PWRC |
| 276 | DAKR | Dakota Rail | | | RSRV |
| 277 | DAKR | Dakota Rail | | USA | TRAFFIC |
| 278 | DAKS | Dakota Short Line | 7/2005 | | NAKINA |
| 279 | DAKS | DAKOTA SHORT LINE | | | PWRC |
| 280 | DAKS | Dakota Short Line | | | RSRV |
| 281 | DAKS | DAKOTA SHORT LINE | | | SCAC4 |
| 282 | DAKV | DAK LOGISTICS SERVICES | | | SCAC4 |
| 283 | DAKW | DAK-TANA WIRELINE INC | | | SCAC4 |
| 284 | DAKX | DAK Americas LLC | added 10/2001; 7/2005 | | NAKINA |
| 285 | DAKX | DAK AMERICAS, LLC | | | PWRC |
| 286 | DAKX | DAK Americas | | | RSRV |
| 287 | DAKX | DAK AMERICAS LLC | | | SCAC4 |
| 288 | DAKX | DAK Americas LLC | | MEX | TRAFFIC |
| 289 | DAKY | DAILY TRUCKING | | | SCAC4 |
| 290 | DAL | Delta Air Lines, Inc. | IATA: DL, Callsign: Delta, IATA Prefix: 006, | USA | AVCODES |
| 291 | DAL | Delta Air Lines | IATA: DL | | ICAO1 |
| 292 | DAL | Delta Air Line | Real: DAL, DL | USA | TRAFFIC |
| 293 | DALA | DALLAS METRO FREIGHT INC | | | SCAC4 |
| 294 | DALA | Ludwig Dalacker& Sohn , Inh. Kurt Dalacker | | DE | VKM |
| 295 | Dalatåg | Dalatåg AB | 1991 - 1996 | S | svenska-lok.se |
| 296 | DALC | DALINGER OIL | | | SCAC4 |
| 297 | DALE | DALES EQUIPMENT TRANSPORT INC | | | SCAC4 |
| 298 | DALF | DAL FUEL OIL CO LLC | | | SCAC4 |
| 299 | DALH | DASHCO LOGISTICS INC | | | SCAC4 |
| 300 | DALI | DALIAN TIGER SHIPPING LIMITED | | | SCAC4 |
