| 1 | DLX | Dreamline Aviation, LLC | Callsign: Dreamline, | USA | AVCODES |
| 2 | DLX | Catelli Food Products, Ltd. | added 4/1962; eliminated 7/1964 | | NAKINA |
| 3 | DLX | Dyson's Ltd. | 1/1950-4/1961; eliminated 4/1962 | | NAKINA |
| 4 | DLX | Dierks Lumber & Coal Co. | 1/1945 | | NAKINA |
| 5 | DLX | Dyson's Ltd. | 1/52-4/61; eliminated 4/62 | | NRHS |
| 6 | DLX | Catelli Food Products, Ltd. | added 4/62; eliminated 7/64 | | NRHS |
| 7 | DLX | *DIERKS LUMBER & COAL CO. | | | PWRC |
| 8 | DLX | *CATELLI FOOD PRODUCTS, LTD. [DAYSON'S LTD.] | | | PWRC |
| 9 | DLXC | DELTA EXPRESS COURIERS INC | | | SCAC4 |
| 10 | DLXI | DELTA LOGISTICS INC | | | SCAC4 |
| 11 | DLXL | DLC TRANSPORT LLC | | | SCAC4 |
| 12 | DLXM | DLUX MOVERS & STORAGE INC | | | SCAC4 |
| 13 | DLXN | D & L AND SONS TRANSPORTATION INC | | | SCAC4 |
| 14 | DLXO | DE LA TORRE TRANSPORT | | | SCAC4 |
| 15 | DLXP | D L S TRANSPORT LLC | | | SCAC4 |
| 16 | DLXT | DLS TRANSPORT | | | SCAC4 |
