| 1 | GTS | GATS Guinea, S.A. | Callsign: GATS Air, Name changed to GTS Bishkek Ltd. | GQ | AVCODES |
| 2 | GTS | GATS Bishkek Ltd. | Callsign: GATS Air, Name changed from GATS Guinea, S.A. | KS | AVCODES |
| 3 | GTS | Groupe Transair S.A. | IATA: R2, Callsign: Transgroup, | SN | AVCODES |
| 4 | GTS | GTS - General Transport Service S.p.A | | I | TRAFFIC |
| 5 | GTS | Gesellschaft für Gleistechnik Süd GmbH | | DE | VKM |
| 6 | GTSA | GABRIELS TRANSPORTATION SERVICES LL | | | SCAC4 |
| 7 | GTSB | GTS EXPRESS INC | | | SCAC4 |
| 8 | GTSC | GREEN TRANSFER & STORAGE CO | | | SCAC4 |
| 9 | GTSCH | GTS Rail Sagl | | CH | VKM |
| 10 | GTSE | GENTECH SCIENTIFIC INC | | | SCAC4 |
| 11 | GTSF | GENTILE TRANSPORTATION SERVICES INC | | | SCAC4 |
| 12 | GTSI | GTS LOGISTICS | | | SCAC4 |
| 13 | GTSJ | GSTC TRANSPORTATION SERVICES | | | SCAC4 |
| 14 | GTSM | GRAHAM TRANSFER & STORAGE | | | SCAC4 |
| 15 | GTSN | GITTS SPRING COMPANY | | | SCAC4 |
| 16 | GTSO | GREAST SOUTHWEST EXPRESS CO | | | SCAC1 |
| 17 | GTSO | GREAT SOUTHWEST EXPRESS CO INC | | | SCAC4 |
| 18 | GTSP | GOVERNMENT TRANSPORTATION SPECIALIS | | | SCAC4 |
| 19 | GTSQ | GREATWAY TRANSPORTATION SERVICES IN | | | SCAC4 |
| 20 | GTSR | GARCIA TRUCKING SERVICE INC | | | SCAC4 |
| 21 | GTSR | General Transport Service S.p.A. | | IT | VKM |
| 22 | GTSS | GLOBAL TRANSPORTATION SYSTEMS INC | | | SCAC4 |
| 23 | GTST | G T S | | | SCAC4 |
| 24 | GTSU | SHANGHAI GRAND SHIPPING AGENCY CO LIMITED | | PRC | BIC |
| 25 | GTSU | GENERAL TRANSPORT AG | | | SCAC4 |
| 26 | GTSV | GIANT TRANSPORTATION SERVICES LLC | | | SCAC4 |
| 27 | GTSW | GORDON TRAILER SALES AND RENTALS | | | SCAC4 |
| 28 | GTSY | GST TRANSPORTES SA DE CV | | | SCAC4 |
