| 1 | GLK | Aspan Airlines JSC | Callsign: Kazak, | KZ | AVCODES |
| 2 | GLKB | GARELICK FARMS LLC | | | SCAC4 |
| 3 | GLKE | GREAT LAKES AREA EXPRESS, INC | | | SCAC1 |
| 4 | GLKE | GREAT LAKES AREA EXPRESS INC | | | SCAC4 |
| 5 | GLKF | GREAT LAKES FLEET INC | | | SCAC4 |
| 6 | GLKH | GRACEFUL LION TRUCKING CORPORATION, | | | SCAC4 |
| 7 | GLKI | GREAT LAKES MODULAR CORPORATION | | | SCAC4 |
| 8 | GLKK | GREEN PLAINS GRAIN COMPANY LLC | | | SCAC4 |
| 9 | GLKL | GREAT LAKES TRUCK BROKEAGE LLC | | | SCAC4 |
| 10 | GLKM | GLIK IMPORTS INC | | | SCAC4 |
| 11 | GLKN | GLK TRANSPORT INC | | | SCAC4 |
| 12 | GLKO | GLENKO ENTERPRISES (1994) LTD | | | SCAC4 |
| 13 | GLKS | GREAT LAKES TRUCKING CO INC | | | SCAC4 |
| 14 | GLKU | LANXESS CORPORATION | | USA | BIC |
| 15 | GLKU | GREAT LAKES CHEMICAL CORP. | | | PWRC |
| 16 | GLKU | Great Lakes Chemical Corporation | | | RSRV |
| 17 | GLKU | GREAT LAKES CHEMICAL CORPORATION | | | SCAC4 |
| 18 | GLKV | GREAT LAKES AVIATION LTD | | | SCAC4 |
| 19 | GLKX | Great Lakes Chemical Corp. | added 4/1982; 1/1994-7/2005; eliminated 10/2006 | | NAKINA |
| 20 | GLKX | Great Lakes Coal & Coke Co. | 7/1937-4/1938 (not listed) | | NAKINA |
| 21 | GLKX | Great Lakes Chemical Corp. | added 4/82; 1/94-7/2000 | | NRHS |
| 22 | GLKX | *GREAT LAKES COAL & COKE CO. | | | PWRC |
| 23 | GLKX | +GREAT LAKES CHEMICAL CORP. | | | PWRC |
| 24 | GLKX | Great Lakes Chemical Corporation | | | RSRV |
| 25 | GLKX | GREAT LAKES CHEMICAL CORP | | | SCAC4 |
| 26 | GLKY | GREAT LAKES BOAT TRANSPORT | | | SCAC4 |
