| 1 | DOC | Norsk Luftambulanse A/S | Callsign: Helidoc, | N | AVCODES |
| 2 | DOC | Norsk Luftambulanse | | | ICAO1 |
| 3 | DOCA | DO CA SRL | | | SCAC4 |
| 4 | DOCB | DICKS OIL CO INC OF BOSTON | | | SCAC4 |
| 5 | DOCC | DIXIE TRANSPORT INC | | | SCAC4 |
| 6 | DOCE | DIMENSION FABRICATORS INC | | | SCAC4 |
| 7 | DOCH | D O C TRANSPORTATION | | | SCAC4 |
| 8 | DOCI | DORR OIL CO INC | | | SCAC4 |
| 9 | DOCJ | DP OIL COMPANY | | | SCAC4 |
| 10 | DOCK | Docklands Buses | | GB | TRAFFIC |
| 11 | DOCL | DOWNEY, MICHAEL B | | | SCAC4 |
| 12 | DOCM | DISCOUNT OIL COMPANY | | | SCAC4 |
| 13 | DOCN | DIAMOND OIL CO | | | SCAC4 |
| 14 | DOCS | DOCS TRANSPORTATION | | | SCAC4 |
| 15 | DOCU | USDOC NOAA / PMEL | | USA | BIC |
| 16 | DOCU | USDOC NOAA / PMEL | | | RSRV |
| 17 | DOCU | USDOC/NOAA/PMEL/AD | | | SCAC4 |
| 18 | DOCV | DAVIDSON OIL CORP | | | SCAC4 |
| 19 | DOCX | Invista (Canada) Co. | added 1/2010 | | NAKINA |
| 20 | DOCX | Du Pont of Canada Ltd. | eliminated 1/2010 | | NAKINA |
| 21 | DOCX | Du Pont Canada Inc. | added 1/1980; 1/1980-7/2005; eliminated 4/2008 | | NAKINA |
| 22 | DOCX | DuPont of Canada Ltd. | added 10/1965; 10/1966-1/1975; eliminated 1/1980 | | NAKINA |
| 23 | DOCX | Diamond Alkali Organic Chemicals Division, Inc. | 7/1954 (not listed) | | NAKINA |
| 24 | DOCX | DuPont of Canada Ltd. | added 10/65; 10/66-1/75; eliminated 1/80 | | NRHS |
| 25 | DOCX | Du Pont Canada Inc. | added 1/80; 1/80-7/2000 | | NRHS |
| 26 | DOCX | *DIAMOND ALKALI ORGANIC CHEMICALS DIV. | | | PWRC |
| 27 | DOCX | +DUPONT CANADA INC. | | | PWRC |
| 28 | DOCX | Du Pont Canada | | | RSRV |
| 29 | DOCX | INVISTA (CANADA) COMPANY | | | SCAC4 |
| 30 | DOCY | DOC'S TRUCKING INC | | | SCAC4 |
