| 1 | DGC | Servicio Aereo de la Guardia Civil | | E | AVCODES |
| 2 | DGCC | DIGNITY CHARTERING CORPORATION | | | SCAC4 |
| 3 | DGCI | DELGADO CARRILLO, JAVIER | | | SCAC4 |
| 4 | DGCL | DISTINGUISHED CHARTERS LLC | | | SCAC4 |
| 5 | DGCN | DELALLO, GEORGE COMPANY INC | | | SCAC4 |
| 6 | DGCO | D G C | | | SCAC4 |
| 7 | DGCX | Dakota Gasification Co. | added 10/1996; 7/2000-7/2005 | | NAKINA |
| 8 | DGCX | The Diamond Gasoline Co. | 8/1920-7/1923 | | NAKINA |
| 9 | DGCX | Dakota Gasification Co. | added 10/96; 7/2000 | | NRHS |
| 10 | DGCX | *DIAMOND GASOLINE CO. | | | PWRC |
| 11 | DGCX | +DAKOTA GASIFICATION COMPANY | | | PWRC |
| 12 | DGCX | Dakota Gasification | | | RSRV |
