| 1 | GIL | Gill Air | IATA: GX, Callsign: Gillair, IATA designator changed to 9S | GB | AVCODES |
| 2 | GIL | Gill Aviation Ltd. | IATA: 9C, Callsign: Gillair, Ceased Operations on 20 September 2001. | GB | AVCODES |
| 3 | GIL | Gill Aviation Ltd. | IATA: NG, Callsign: Gillair, | GB | AVCODES |
| 4 | GIL | African International Transport SA | Callsign: African Transport, | GUI | AVCODES |
| 5 | GIL | Georgian International Airlines Ltd. | IATA: 4L, Name changed from Euroline | GE | AVCODES |
| 6 | GIL | African International Transport | | | ICAO1 |
| 7 | GILB | GENOA INDY LIGHTS | | | SCAC4 |
| 8 | GILE | GILES, DAVID B TRUCKING LTD | | | SCAC4 |
| 9 | GILH | GREEN INTEGRATED LOGISTICS INC | | | SCAC4 |
| 10 | GILI | GIULITTO TRANSPORT LLC | | | SCAC4 |
| 11 | GILLIG | | | USA | TRAFFIC |
| 12 | GILO | G I L LOGISTIC LLC | | | SCAC4 |
| 13 | GILT | GILTNER MILK TRANSPORTATION LLC | | | SCAC4 |
| 14 | GILU | GEEST INDUSTRIES LTD. | | | SCAC4 |
| 15 | GILV | GALVAN INTERNATIONAL LOGISTICS SERV | | | SCAC4 |
| 16 | GILW | GENPRO INC (LTL DIVISION) | | | SCAC4 |
| 17 | GILX | Gilman Paper Co. | added 10/1992; 1/1994-7/2000; eliminated 7/2003; 7/2005 (not listed) | | NAKINA |
| 18 | GILX | Gilmore Oil Co. | 7/1935-1/1941 | | NAKINA |
| 19 | GILX | Gilmore Oil Co., Ltd. | 7/1930-7/1932 | | NAKINA |
| 20 | GILX | Gilmore Oil Co. | Apr-38 | | NRHS |
| 21 | GILX | Gilman Paper Co. | added 10/92; 1/94-7/2000 | | NRHS |
| 22 | GILX | GILMAN PAPER COMPANY [GILMORE OIL CO.] | | | PWRC |
| 23 | GILX | Gilman Paper | | | RSRV |
| 24 | GILX | GILMAN PAPER COMPANY | | | SCAC4 |
