| 1 | KGC | Peach Air | Callsign: Goldcrest, Founded in 1996. Merged into Thomas Cook in 1999. | GB | AVCODES |
| 2 | KGC | Air KG | Callsign: Salam Air, | KS | AVCODES |
| 3 | KGC | Peach Air | | | ICAO1 |
| 4 | KGCA | KINGSVILLE CARTAGE | | | SCAC4 |
| 5 | KGCH | KEGLEY CHARTER SERVICE | | | SCAC3 |
| 6 | KGCH | KOSIOR, DAVID | | | SCAC4 |
| 7 | KGCO | K G CONSTRUCTION COMPANY | | | SCAC3 |
| 8 | KGCS | KING CONSTRUCTION COMPANY INC | | | SCAC3 |
| 9 | KGCT | KGJS CEMENT A/S | | | SCAC4 |
| 10 | KGCU | KAMIGUMI CO., LTD | | | SCAC3 |
| 11 | KGCX | INDSPEC Chemical Corp. | added 10/1989; 1/1994; eliminated 1/1998; 7/2000-7/2005 | | NAKINA |
| 12 | KGCX | Koppers Co., Inc. | added 4/1955; 10/1957-1/1980; eliminated 10/1989 | | NAKINA |
| 13 | KGCX | Koppers Co., Inc. | added 4/55; 10/57-1/80; eliminated 10/89 | | NRHS |
| 14 | KGCX | INDSPEC Chemical Corp. | added 10/89; 1/94; eliminated 1/98; 7/2000 | | NRHS |
| 15 | KGCX | INDSPEC CHEMICAL CORPORATION [KOPPERS CO.] | | | PWRC |
| 16 | KGCX | Koppers (INDSPEC Chemical Corporation) | | | RSRV |
| 17 | KGCX | INDSPEC CHEMICAL CORPORATION | | | SCAC4 |
| 18 | KGCZ | KOKOMO GRAIN COMPANY | | | PWRC |
