| 1401 | DE | Condor Flugdienst GmbH | ICAO: CFG, Callsign: Condor, IATA Prefix: 881, IATA designator changed from DF | D | AVCODES |
| 1402 | DE | Delta Air Transport (D.A.T.) | ICAO: DAT, Callsign: Deltair, IATA designator changed to QG | B | AVCODES |
| 1403 | DE | Dortmunder Eisenbahn GmbH | Dortmund | D | privat-bahn.de |
| 1404 | DE | DETROIT EDISON COMPANY | | | PWRC |
| 1405 | DE | Dortmunder Eisenbahn | | D | TRAFFIC |
| 1406 | DE | Dortmunder Eisenbahn | | DE | VKM |
| 1407 | DEA | Delta Aerotaxi | Callsign: Jet Service, | I | AVCODES |
| 1408 | DEA | Delta Aerotaxi | | | ICAO1 |
| 1409 | DEA | DELTA BUS LINES INC | | | SCAC4 |
| 1410 | DEAA | DELUXE AUTO CARRIERS INC | | | SCAC4 |
| 1411 | DEAB | DIRECT EXPRESS COURIER INC | | | SCAC4 |
| 1412 | DEAC | DEBRITO TRANSPORTATION INC | | | SCAC4 |
| 1413 | DEAE | DEBNER TRANSPORT INC | | | SCAC4 |
| 1414 | DEAG | Dürener Eisenbahn AG | City: Düren | D | TRAFFIC |
| 1415 | DEAN | DEANDA TRUCKING | | | SCAC4 |
| 1416 | DEAO | DENIAL ART | | | SCAC4 |
| 1417 | DEAT | DENA TRANSPORT | | | SCAC4 |
| 1418 | DEAU | JSC ECOMET-S | | RUS | BIC |
| 1419 | DEAU | JSC E3COMET-S | | | SCAC4 |
| 1420 | DEAW | D & S EXPRESS DELIVERY | | | SCAC4 |
| 1421 | DEAX | DEACERO S A DE C V | | | SCAC4 |
| 1422 | DEAY | DEAL TRANSPORTATION INC | | | SCAC4 |
| 1423 | DEB | Debonair Airways Ltd. | IATA: 2G, Callsign: Debonair, Ceased operations. Designator 2G reinsgtated by IATA | GB | AVCODES |
| 1424 | DEB | Debonair | | GB | TRAFFIC |
| 1425 | DEBD | DENISON, DONALD B | | | SCAC4 |
| 1426 | DEBE | DEBOER TRANSPORT LLC | | | SCAC4 |
| 1427 | DEBG | DEUTSCH TRUCKING | | | SCAC4 |
| 1428 | DEBG | Dampfzug-Betriebs-Gemeinschaft e.V | | DE | VKM |
| 1429 | DEBI | DERENIA ENTERPRISES INC | | | SCAC4 |
| 1430 | DEBJ | DEVAL DENIZCILIK VE TICARET AS | | | SCAC4 |
| 1431 | DEBK | DEBKO INC | | | SCAC4 |
| 1432 | DEBL | DEL TRANSIT LLC | | | SCAC4 |
| 1433 | DEBN | DE LOS SANTOS TRUCKING | | | SCAC4 |
| 1434 | DEBP | DICKERSON TRANSPORTATION INC | | | SCAC4 |
| 1435 | DEBQ | DOUBLE EAGLE BULK CARRIERS INC | | | SCAC4 |
| 1436 | DEBU | NASACO INTERNATIONAL LIMITED | | CH | BIC |
| 1437 | DEBU | NASACO INTERNL LIMITED | | | SCAC4 |
| 1438 | DEBV | DRAGON ENTERPRISES LTD MARSHALL ISL | | | SCAC4 |
| 1439 | DEBX | Ceres AG Products | 7/2005 (not listed) | | NAKINA |
| 1440 | DEBX | CERES AG PRODUCTS | | | PWRC |
| 1441 | DEBX | Ceres AG Products | | | RSRV |
| 1442 | DEBZ | DEBOERS TRANSPORTATION INC | | | SCAC4 |
| 1443 | DEC | Deltacraft Oy | IATA: 4L, Callsign: Deltacraft, Designator 4L* recalled by IATA | FIN | AVCODES |
| 1444 | DEC | Deccan Cargo & Express Logistics Pvt Ltd | IATA: 3C, Callsign: Deccan Cargo, IATA Prefix: 360, | IND | AVCODES |
| 1445 | DECAMP | Decamp Bus Lines | | USA | TRAFFIC |
| 1446 | DECB | DEUTSCH ENGINEERED CONNECTING DEVIC | | | SCAC4 |
| 1447 | DECD | DEC TRANSPORT INC | | | SCAC4 |
| 1448 | DECJ | DE CARO TRUCKING CO INC | | | SCAC4 |
| 1449 | DECM | DEL-CO SYSTEMS | | | SCAC4 |
| 1450 | DECP | DIRECT EXPEDITED CORP | | | SCAC4 |
| 1451 | DECR | DECOR N W INC | | | SCAC4 |
| 1452 | DECT | DEC TRUCKING | | | SCAC4 |
| 1453 | DECU | DECCAN FINE CHEMICALS INDIA PRIVATE LIMITED | | IND | BIC |
| 1454 | DECX | Duval Engineering & Contracting Co. | 4/1947-10/1957; eliminated 4/1960 | | NAKINA |
| 1455 | DECX | Duval Engineering & Contracting Co. | 1/52-10/57 | | NRHS |
| 1456 | DECX | DUVAL ENGINEERING & CONTRACTING CO. | | | PWRC |
| 1457 | DECZ | DECKER COAL CO. | | | PWRC |
| 1458 | DECZ | DIRECT CHASSIS & EQUIPMENT | | | SCAC4 |
| 1459 | DEDA | DEDICATED CARRIERS INC | | | SCAC4 |
| 1460 | DEDD | DEDICATED TRANSPORTATION LLC | | | SCAC4 |
| 1461 | DEDE | DEDICATED TRANSPORT SERVICES INC | | | SCAC4 |
| 1462 | DEDG | DEDICATED TRUCKING INC | | | SCAC4 |
| 1463 | DEDI | DEDICATED TRANSPORT LLC | | | SCAC4 |
| 1464 | DEDK | DOVE MARINE CO LTD | | | SCAC4 |
| 1465 | DEDL | DEDOLA GLOBAL LOGISTICS INC | | | SCAC4 |
| 1466 | DEDO | DUENAS TRUCKING | | | SCAC4 |
| 1467 | DEDR | DEPENDABLE DISTRIBUTION SERVICES IN | | | SCAC4 |
| 1468 | DEDS | DEDICATED EXPRESS LLC | | | SCAC4 |
| 1469 | DEDT | DEDICATED EXPRESS LOGISTICS | | | SCAC4 |
| 1470 | DEDY | DIRECT EXPRESS DELIVERY INC | | | SCAC4 |
| 1471 | DEE | Transportation America Corporation d/b/a Dixie Airways | Callsign: Tacair, Name changed from Dixie Airways | USA | AVCODES |
| 1472 | DEE | Dixie Airways | Callsign: Dixair, Name changed to Transportation America Corporation d/b/a Dixie Airways | USA | AVCODES |
| 1473 | DEE | Dixie Airways | | | ICAO1 |
| 1474 | DEEA | DEEPSEA AGENCY LTD | | | SCAC4 |
| 1475 | DEEF | DEER CREEK FARMS | | | SCAC4 |
| 1476 | DEEL | DEN-EL TRANSFER CO INC | | | SCAC4 |
| 1477 | DEEM | DEES MARINE AND POWERSPORTS | | | SCAC4 |
| 1478 | DEEP | DEEP EXPRESS | | | SCAC4 |
| 1479 | DEES | DEDIC8ED EXPRESS LLC | | | SCAC4 |
| 1480 | DEEX | The Detroit Edison Co. | added 10/1968; 4/1970-7/2005 | | NAKINA |
| 1481 | DEEX | The Detroit Edison Co. | added 10/68; 4/70-7/2000 | | NRHS |
| 1482 | DEEX | DETROIT EDISON COMPANY | | | PWRC |
| 1483 | DEEX | Detroit Edison | | | RSRV |
| 1484 | DEEX | DETROIT EDISON COMPANY | | | SCAC4 |
| 1485 | DEEX | The Detroit Edison Co. | | USA | TRAFFIC |
| 1486 | DEF | Aviation Defense Service | Callsign: Tirpa, | F | AVCODES |
| 1487 | DEF | Aviation Defense Service | | | ICAO1 |
| 1488 | DEFA | DEFFEBACH, IAN | | | SCAC4 |
| 1489 | DEFC | DELFIC GRACE SHIPPING LIMITED | | | SCAC4 |
| 1490 | DEFV | DELUXE FREIGHT SERVICES LTD | | | SCAC4 |
| 1491 | DEG | Air Service Groningen | | | ICAO1 |
| 1492 | DEGD | DEGRAND, JOHN & SON INC | | | SCAC4 |
| 1493 | DEGL | DEGOL AVIATION | | | SCAC4 |
| 1494 | DEGR | DeGROOT MOTOR SERVICE, INC | | | SCAC1 |
| 1495 | DEGS | DEGENSTEIN TRUCKING CO | | | SCAC4 |
| 1496 | DEGUS | Degussa AG | | DE | VKM |
| 1497 | DEGX | Mississippi Power Co. | added 7/1978; 1/1980-7/2005 | | NAKINA |
| 1498 | DEGX | Mississippi Power Co. | added 7/78; 1/80-7/2000 | | NRHS |
| 1499 | DEGX | MISSISSIPPI POWER COMPANY | | | PWRC |
| 1500 | DEGX | Mississippi Power | | | RSRV |
