| 1 | DRL | Omni Air Transport, LLC | Callsign: Driller, ICAO Designator changed from OAT | USA | AVCODES |
| 2 | DRLD | DOENZ RANCHES LTD | | | SCAC4 |
| 3 | DRLF | D R LOGISTICS CORP | | | SCAC4 |
| 4 | DRLG | DARLING FREIGHT INC | | | PWRC |
| 5 | DRLI | DIRECT LINES INC | | | SCAC4 |
| 6 | DRLL | DAVES RECYCLING LLC | | | SCAC4 |
| 7 | DRLQ | D R LOGISTICS LLC | | | SCAC4 |
| 8 | DRLR | DRL TRANSPORT ENTERPRISES INC | | | SCAC4 |
| 9 | DRLT | DRIVE LOGISTICS | | | SCAC4 |
| 10 | DRLX | Delaware Railcar Leasing, Inc. | added 4/1968; 4/1970-1/1975; eliminated 7/1979 | | NAKINA |
| 11 | DRLX | Delaware Railcar Leasing, Inc. | added 4/68; 4/70-1/75; eliminated 7/79 | | NRHS |
| 12 | DRLX | DELAWARE RAILCAR LEASING, INC. | | | PWRC |
| 13 | DRLX | DELAWARE RAILCAR LEASING, INC. | | | PWRC |
