| 1 | DEL | Carib Aviation Limited | IATA: 6C, Callsign: Red Tail, IATA designator changed to 3Q | AG | AVCODES |
| 2 | DEL | Delta Air Regionalflugverkhr GmbH | IATA: DI, Callsign: Bodensse, Merge into form Deutsche BA | D | AVCODES |
| 3 | DEL | Carib Aviation Limited | IATA: K7, Callsign: Red Tail, Designator K7* recalled by IATA | AG | AVCODES |
| 4 | DEL | Delta Air Regionalflugverkhr GmbH | IATA: BO, Callsign: Bravo Oscar, ICAO callsign changed to Delta Air | D | AVCODES |
| 5 | DEL | Carib Aviation Limited | IATA: 3Q, Callsign: Red Tail, Founded in 1972. Ceased operations on 30 September 2008. IATA designator changed from 6C | AG | AVCODES |
| 6 | DEL | Delta Air Regionalflugverkhr GmbH | IATA: BO, Callsign: Delta Air, IATA Designator changed to DI. ICAO callsign changed from Bravo Oscar | D | AVCODES |
| 7 | DEL | Carib Aviation | | | ICAO1 |
| 8 | DELBUS | Delbus GmbH & Co. KG | | D | TRAFFIC |
| 9 | DELC | DEL-CO TRANSPORT SERVICES INC | | | SCAC4 |
| 10 | DELD | DELLES CARRIERS INC | | | SCAC4 |
| 11 | DELE | DE LEONS TRANSPORT | | | SCAC4 |
| 12 | DELF | DAYNAS EXPRESS LINE LLC | | | SCAC4 |
| 13 | DELIJN | | | B | TRAFFIC |
| 14 | DELK | DIAMOND EXPRESS LLC | | | SCAC4 |
| 15 | DELM | DUNKSBURG EXPRESS LLC | | | SCAC4 |
| 16 | DELP | DELRAY PLANTS INC | | | SCAC4 |
| 17 | DELQ | D & E OIL INC | | | SCAC4 |
| 18 | DELT | DELTA LINES INC | | | PWRC |
| 19 | DELT | DELTA TRUCKING INC | | | SCAC4 |
| 20 | DELT | DELTA GAS COV SRL | | RO | VKM |
| 21 | DELTA | DeltaRail GmbH | | DE | VKM |
| 22 | DELTAK | Deltakar | | BG | TRAFFIC |
| 23 | DELU | AMARAL INDUSTRIES COMMON LAW | | USA | BIC |
| 24 | DELU | E-LOGISTICS SA | | | SCAC4 |
| 25 | DELX | DELCORA | | | PWRC |
