| 5601 | GSUL | GEOMETRIC SHAPES UNLIMITED | | | SCAC4 |
| 5602 | GSUR | GLOBUS SHIPMANAGEMENT CORP | | | SCAC4 |
| 5603 | GSUS | GOLDEN SEA (USA) INC | | | SCAC4 |
| 5604 | GSUT | GRABER SUPPLY LLC | | | SCAC4 |
| 5605 | GSUZ | GULF STSTE UTILITIES | | | PWRC |
| 5606 | GSV | Agrocentr-Avia | Callsign: Agrav, | KZ | AVCODES |
| 5607 | GSV | Agrocentr-Avia | | | ICAO1 |
| 5608 | GSVC | GM STAR VEGA COMPANIA NAVIERA S A | | | SCAC4 |
| 5609 | GSVP | GSV TRANSPORTATION INC | | | SCAC4 |
| 5610 | GSVX | Gerber Produce Co., Division of Fremont Canning Co. (Union Refrigerator Transit Co.) | 7/1935 | | NAKINA |
| 5611 | GSVZ | GREAT SHENANDOAH VALLEY DEVELOPMANT | | | PWRC |
| 5612 | GSW | Sky Wings Airlines S.A. | IATA: ND, Callsign: Arrow Jet, Founded in 2004. Merged with the Ukrainian airline Khors Aircompany on 1 December 2012. | GR | AVCODES |
| 5613 | GSW | Germania Flug AG t/a Holiday Jet | IATA: GM, Callsign: Eiger, Founded in August 2014. Name changed to Germania Flug AG in November 2019. | CH | AVCODES |
| 5614 | GSW | Chair Airlines AG t/a chair | IATA: GM, Callsign: Eiger, Founded in August 2014. Name changed from Germania Flug AG t/a Holiday Jet in November 2015 then changed from Germania Flug AG w.e.f. 11 June 2019. | CH | AVCODES |
| 5615 | GSW | Germania Flug AG | IATA: GM, Callsign: Eiger, Founded in August 2014. Name changed from Germania Flug AG t/a Holiday Jet in November 2015. Name changed to Chair Airlines AG t/a chair w.e.f. 01 July 2019. | CH | AVCODES |
| 5616 | GSW | Sky Wings Airlines | | | ICAO1 |
| 5617 | GSW | Great Southwest R.R., Inc. | 1/1975-1/1980; eliminated 4/1988 | | NAKINA |
| 5618 | GSW | Great Southwest R.R., Inc. | 1/75-1/80; eliminated 4/88 | | NRHS |
| 5619 | GSW | GREAT SOUTHWEST RAILROAD INC. | | | PWRC |
| 5620 | GSW | Great Southwest Railroad | | | RSRV |
| 5621 | GSW | Germania Flug | | CH | TRAFFIC |
| 5622 | GSWA | GREAT SPRING WATERS OF AMERICA INC | | | SCAC4 |
| 5623 | GSWD | GASAWAY DISTRIBUTORS INC | | | SCAC4 |
| 5624 | GSWG | GULF SOUTH WAREHOUSE | | | SCAC4 |
| 5625 | GSWH | GRAND STREET WAREHOUSE INC | | | SCAC4 |
| 5626 | GSWR | Georgia Southwestern R.R., Inc. | 7/2005 | | NAKINA |
| 5627 | GSWR | Georgia Southwestern Division, South Carolina Central R.R. Co., Inc. | added 10/1989; 1/1994-7/2000 | | NAKINA |
| 5628 | GSWR | Georgia Southwestern Division, South Carolina Central R.R. Co., Inc. | added 10/89; 1/94-7/2000 | | NRHS |
| 5629 | GSWR | GEORGIA SOUTHWESTERN RAILROAD INC., DIV. SOUTH CAROLINA CENTRAL RR | | | PWRC |
| 5630 | GSWR | South Carolina Central Railroad (Georgia Southwestern Division) | | | RSRV |
| 5631 | GSWR | GEORGIA SOUTHWESTERN RAILROAD INC | | | SCAC4 |
| 5632 | GSWR | Georgia Southwestern | | USA | TRAFFIC |
| 5633 | GSWS | GWI SWITCHING SYSYEMS {GENNESSEE & WYOMING SWITCHING} | | | PWRC |
| 5634 | GSWS | GSW TRANSPORTATION INC | | | SCAC4 |
| 5635 | GSWX | G&S Co., Inc. | added 1/1980; 1/1980; eliminated 4/1988 | | NAKINA |
| 5636 | GSWX | Glen Summit Springs Water Co., Inc. | 7/1935-1/1950 | | NAKINA |
| 5637 | GSWX | Glen Summit Springs Water Co., Inc. | Apr-38 | | NRHS |
| 5638 | GSWX | G&S Co., Inc. | added 1/80; 1/80; eliminated 4/88 | | NRHS |
| 5639 | GSWX | *GLEN SUMMIT SPRINGS WATER CO., INC. | | | PWRC |
| 5640 | GSWX | *G & S SUPPLY INC. | | | PWRC |
| 5641 | GSWX | G and S Supply | | | RSRV |
| 5642 | GSX | The Globe Soap Co. | 8/1920-7/1923 | | NAKINA |
| 5643 | GSX | Mather Stock Car Co. | 4/1938-7/1954 | | NAKINA |
| 5644 | GSX | Gotham Live Stock Express (Mather Stock Car Co.) | Apr-38 | | NRHS |
| 5645 | GSX | Mather Stock Car Co. | Jan-52 | | NRHS |
| 5646 | GSX | *GLOBE SOAP CO. | | | PWRC |
| 5647 | GSX | *MATHER STOCK CAR CO. | | | PWRC |
| 5648 | GSX | Mather Stock Car Co. | | USA | TRAFFIC |
| 5649 | GSXA | G & S XPRESS (GSX) | | | SCAC4 |
| 5650 | GSXB | GSA TRANSPORT | | | SCAC4 |
| 5651 | GSXM | GS TRANS | | | SCAC4 |
| 5652 | GSXO | GENESIS TRANSPORTATION | | | SCAC4 |
| 5653 | GSXP | GOLDEN STATE EXPRESS INC | | | SCAC4 |
| 5654 | GSXQ | GOLD STANDARD TRANSPORTATION INC | | | SCAC4 |
| 5655 | GSXR | GULFSTREAM EXPRESS INC | | | SCAC4 |
| 5656 | GSXT | GAS TRANSPORTERS | | | SCAC4 |
| 5657 | GSXU | GOLD STAR LINE LTD | | | SCAC4 |
| 5658 | GSY | Guard Systems ASA | Callsign: Guard Air, | N | AVCODES |
| 5659 | GSY | Devinaire, LLC | Callsign: Gray Sky, | USA | AVCODES |
| 5660 | GSY | Guard Systems | | | ICAO1 |
| 5661 | GSYM | GREATER SYRACUSE MOVING & STORAGE C | | | SCAC4 |
| 5662 | GSZ | GLAZIER SALVAGE | | | PWRC |
| 5663 | GT | GB Airways Ltd. | ICAO: GBL, Callsign: GeeBee Airways, IATA Prefix: 171, Merged into Easyjet on 30 March, 2008. ICAO callsign changed from Gibair | GB | AVCODES |
| 5664 | GT | Gibraltar Airways Ltd. | Callsign: Gibair, IATA Prefix: 171, Name changed to GB Airways Ltd. | GB | AVCODES |
| 5665 | GT | GB Airways Ltd. | ICAO: GBL, Callsign: Gibair, IATA Prefix: 171, Name changed from Gibraltar Airways Ltd. | GB | AVCODES |
| 5666 | GT | Vista Georgia Ltd. | ICAO: AJD, Callsign: Vista Georgia, Commenced operations on 05 August 2014. Ceased operations in May 2015. | GE | AVCODES |
| 5667 | GT | P.C. Air Co., Ltd. | ICAO: PCA, Callsign: Piyo Air, Ceased operations. | T | AVCODES |
| 5668 | GT | Air Guilin Co., Ltd. | ICAO: CGH, Callsign: Welkin, IATA Prefix: 730, Commenced operations on 25 June 2016. | PRC | AVCODES |
| 5669 | GT | Grand Trunk Ry. | 4/1938-7/1954 | | NAKINA |
| 5670 | GT | Grand Trunk Ry. (Canadian National Rys.) | 7/1930-7/1936 | | NAKINA |
| 5671 | GT | Grand Trunk Ry. System (Canadian National Rys.) | 7/1923 | | NAKINA |
| 5672 | GT | Grand Trunk Ry. | 4/38-1/52 | | NRHS |
| 5673 | GT | CANADIAN NATIONAL [GRAND TRUNK RWY] | | | PWRC |
| 5674 | GT | Grand Trunk Railway | | | RSRV |
| 5675 | GT | GULF TRANSPORT COMPANY | | | SCAC4 |
| 5676 | GT | Grand Trunk Ry. | | USA | TRAFFIC |
| 5677 | GT&W | Gulf, Texas & Western Ry. Co. | 7/1923-7/1930 | | NAKINA |
| 5678 | GT&W | GULF, TEXAS & WESTERN RWY. CO. | | | PWRC |
| 5679 | GTA | GT Aviation | Callsign: GeeTee Avia, | GB | AVCODES |
| 5680 | GTA | Gitanair | IATA: VG, Callsign: Gitanair, | I | AVCODES |
| 5681 | GTA | City Airways Company Limited dba City Airways | IATA: E8, Callsign: City Airways, Commenced operations in September 2012. Suspended operations on 13 February 2016. | T | AVCODES |
| 5682 | GTA | Grand Trunk Western R.R. Inc. | 1/1994-7/2005 | | NAKINA |
| 5683 | GTA | Grand Trunk Western R.R. Co. | 1/1975-1/1980; eliminated 1/1983 | | NAKINA |
| 5684 | GTA | Grand Trunk Western R.R. Co. | 1/75-1/80; eliminated 1/83 | | NRHS |
| 5685 | GTA | Grand Trunk Western R.R. Inc. | 1/94-7/2000 | | NRHS |
| 5686 | GTA | CANADIAN NATIONAL [GRAND TRUNK WESTERN] | | | PWRC |
| 5687 | GTA | Grand Trunk Western (Canadian National Railway) | | | RSRV |
| 5688 | GTAE | GTL ENTERPRISES INC | | | SCAC4 |
| 5689 | GTAG | GABRIELS TOWING AND TRUCKING | | | SCAC4 |
| 5690 | GTAH | GATES MANUFACTURING | | | SCAC4 |
| 5691 | GTAL | GREAT AMERICAN LINES INC | | | SCAC4 |
| 5692 | GTAN | GREAT TRANSPORTATION ENTERPRISE INC | | | SCAC4 |
| 5693 | GTAO | GASEL TRANSPORTATION LINES INC | | | SCAC4 |
| 5694 | GTAP | GANECA TRANSPORT (DIVISION OF TFI T | | | SCAC4 |
| 5695 | GTAQ | GOGI TRUCKING INC | | | SCAC4 |
| 5696 | GTAS | GUR-ISH TRUCKING LTD | | | SCAC4 |
| 5697 | GTAT | GOGON TRANSPORT | | | SCAC4 |
| 5698 | GTAU | GALLIKER TRANSPORT AG | | CH | BIC |
| 5699 | GTAU | GALLIKER TRANSPORT AG | | | SCAC4 |
| 5700 | GTAU | Greentrains | | AUS | TRAFFIC |
