| 5501 | GSPM | GARDEN STATE ASPHALT MATERIALS INC | | | SCAC4 |
| 5502 | GSPN | GASPERSON TRANSFER | | | SCAC4 |
| 5503 | GSPO | GAN-SPIRIT CO LTD | | | SCAC4 |
| 5504 | GSPP | GRANNIS PETROLEUM PRODUCTS INC | | | SCAC4 |
| 5505 | GSPT | GENERAL TRANSPORT INC | | | SCAC4 |
| 5506 | GSPU | SEACUBE CONTAINERS LLC | | USA | BIC |
| 5507 | GSPU | Seacube Container Leasing | | | RSRV |
| 5508 | GSPX | Great Southern Plywood Co. | added 7/1975; 1/1980; eliminated 10/1988 | | NAKINA |
| 5509 | GSPX | Gaspesia Sulphite Co., Ltd. | 1/1950; 1/1952 (not listed) | | NAKINA |
| 5510 | GSPX | Gaspesia Sulphite Co., Ltd. | Jan-52 | | NRHS |
| 5511 | GSPX | Great Southern Plywood Co. | added 7/75; 1/80; eliminated 10/88 | | NRHS |
| 5512 | GSPX | *GASPESIA SULPHITE CO., LTD. | | | PWRC |
| 5513 | GSPX | *GREAT SOUTHERN PLYWOOD CO. | | | PWRC |
| 5514 | GSPX | Great Southern Plywood | | | RSRV |
| 5515 | GSPY | GMR SPYRIDON LLC | | | SCAC4 |
| 5516 | GSPZ | GULF STATES PAPER CO. | | | PWRC |
| 5517 | GSQL | GLASS LOGISTIX | | | SCAC4 |
| 5518 | GSQT | G-STAR TRANSPORT LTD | | | SCAC4 |
| 5519 | GSR | Silk Route Airways | IATA: NS, Callsign: Silkroute Airways, Name changed to Caucasus Airlines, ICAO desigantor changed to SRJ. ICAO callsign changed to Caucasus. | GE | AVCODES |
| 5520 | GSR | GREAT SANDHILLS RAILWAY LTD | | | SCAC4 |
| 5521 | GSR | Great Southern Railway | | AUS | TRAFFIC |
| 5522 | GSRB | GARZA SALINAS, REYNALDO | | | SCAC4 |
| 5523 | GSRC | GARCIA SALAS, FRANCISCO | | | SCAC4 |
| 5524 | GSRC | Guangshen Railway | | PRC | TRAFFIC |
| 5525 | GSRG | GSR TRUCKING LLC | | | SCAC4 |
| 5526 | GSRI | GASTELUM RIVERA, HERNAN | | | SCAC4 |
| 5527 | GSRK | G & S TRUCKING | | | SCAC4 |
| 5528 | GSRL | GAS SUPPLY RESOURCES LLC | | | SCAC4 |
| 5529 | GSRN | G S R INTERMODAL TRANSPORTATION INC | | | SCAC4 |
| 5530 | GSRO | G & S RACING TRANSPORT INC | | | SCAC4 |
| 5531 | GSRP | GS TRANS | | | SCAC4 |
| 5532 | GSRU | GOLDEN SOMERSET ROCK LTD | | GB | BIC |
| 5533 | GSRV | GALAXY SERVICES INTERNATIONAL INC | | | SCAC4 |
| 5534 | GSRX | Golden Spike Railroad Services | 7/2000-7/2005 (not listed) | | NAKINA |
| 5535 | GSRX | Great Southern Refining Co. | 7/1923 | | NAKINA |
| 5536 | GSRX | Golden Spike Railroad Services | Jul-00 | | NRHS |
| 5537 | GSRX | *GETTYSBURG SCENIC RAIL TOUR | | | PWRC |
| 5538 | GSRX | +GOLDEN SPIKE RAILROAD SERVICES | | | PWRC |
| 5539 | GSRX | Golden Spike Railroad Services | | | RSRV |
| 5540 | GSRX | GOLDEN SPIKE RAILROAD SERVICES | | | SCAC4 |
| 5541 | GSS | Global Supply Systems Ltd. | Callsign: Jet Lift, Commenced operations on 29 June 2002. Ceased operation in 2014. Name changed from Nouvelleligne Ltd w.e.f. 31 January 2001. | GB | AVCODES |
| 5542 | GSS | GSS Airline S.r.l. | Callsign: Cargo Bird, | RSM | AVCODES |
| 5543 | GSS | Global Supply Systems | | | ICAO1 |
| 5544 | GSS | GSMSTAD | | NL | TRAFFIC |
| 5545 | GSSB | GLOBAL SHIPPING SERVICES | | | SCAC4 |
| 5546 | GSSC | GOLDEN SPREAD SALES COMPANY | | | SCAC4 |
| 5547 | GSSD | GROSS, DEWAYNE TRUCKING | | | SCAC4 |
| 5548 | GSSF | GROSSE TRANSFER | | | SCAC4 |
| 5549 | GSSH | GANSABRE SHIPPING S A | | | SCAC4 |
| 5550 | GSSJ | GILL, S S TRANSPORTATION LLC | | | SCAC4 |
| 5551 | GSSK | GRACE SERVICES S A | | | SCAC4 |
| 5552 | GSSL | GARCIA SALINAS, SANTOS LUIS | | | SCAC4 |
| 5553 | GSSN | G S & SONS TRUCKING | | | SCAC4 |
| 5554 | GSSU | G2 OCEAN AS | | N | BIC |
| 5555 | GSSV | GRIEG STAR SHIPPING AS (CONTAINER D | | | SCAC4 |
| 5556 | GSSW | GRIEG STAR SHIPPING AS (OPEN HATCH | | | SCAC4 |
| 5557 | GSSX | G.S.S. & M. Inc., Rail Division | 7/2005 (not listed) | | NAKINA |
| 5558 | GSSX | Goar's Service & Supply | 4/1947-10/1957; eliminated 4/1961 | | NAKINA |
| 5559 | GSSX | Republic Steel Corp. | 7/1937-4/1938 | | NAKINA |
| 5560 | GSSX | Gulf States Steel Co. | 8/1920-7/1935 | | NAKINA |
| 5561 | GSSX | Republic Steel Corp. (Gulf Steel Division) | Apr-38 | | NRHS |
| 5562 | GSSX | Goar's Service & Supply | 1/52-10/57; eliminated 4/61 | | NRHS |
| 5563 | GSSX | *REPUBLIC STEEL CORP. [GULF STATES STEEL CO.] | | | PWRC |
| 5564 | GSSX | *GOAR'S SERVICE & SUPPLY | | | PWRC |
| 5565 | GSSX | +G. S. S. & M. INC., RAIL DIV. {GOPHER STATE SCRAP AND METAL} | | | PWRC |
| 5566 | GSSX | Gopher State Scrap and Metal | | | RSRV |
| 5567 | GSSX | ALTER TRADING CORPORATION | | | SCAC4 |
| 5568 | GSSY | GANSTAR SHIPPING S A | | | SCAC4 |
| 5569 | GSSZ | GULF STATE STEEL, INC. | | | PWRC |
| 5570 | GST | Ghana Air Shuttle Ltd. | Callsign: Ghana Shuttle, | GH | AVCODES |
| 5571 | GST | Georgian Star | Callsign: Georgian Star, | GE | AVCODES |
| 5572 | GST | Global SuperTanker Services, LLC | Callsign: Supertank, | USA | AVCODES |
| 5573 | GST | GOLDEN STATE TARIFF BUREAU | | | SCAC4 |
| 5574 | GSTC | GOLDSTAR COURIERS | | | SCAC4 |
| 5575 | GSTD | GRINSTEAD, STEPHEN M TRUCKING INC | | | SCAC4 |
| 5576 | GSTF | GOLDEN STATE FLOORING | | | SCAC4 |
| 5577 | GSTH | G & S TRANSPORTATION INC | | | SCAC4 |
| 5578 | GSTL | Garden State Transit Lines | | US-NJ | TRAFFIC |
| 5579 | GSTO | GESTION J P CHABLOZ INC | | | SCAC4 |
| 5580 | GSTP | GOLD STAR TRANSPORT | | | SCAC4 |
| 5581 | GSTR | GO SAFE TRUCKING INC | | | SCAC4 |
| 5582 | GSTR | Gastrade S.A. / Газтрейд АД | | BG | VKM |
| 5583 | GSTS | GST SERVICES INC | | | SCAC4 |
| 5584 | GSTT | GOSELIN TRANSPORTATION | | | SCAC1 |
| 5585 | GSTT | GOSELIN TRANSPORTATION INC | | | SCAC4 |
| 5586 | GSTU | SEACO SRL | | BDS | BIC |
| 5587 | GSTU | GENSTAR CONTAINER CORPORATION | | | PWRC |
| 5588 | GSTU | Genstar Container Corporation | | | RSRV |
| 5589 | GSTU | GENSTAR CONTAINER CORPORATION | | | SCAC4 |
| 5590 | GSTV | GUSTAVOS TRUCKING | | | SCAC4 |
| 5591 | GSTW | G S T | | | SCAC4 |
| 5592 | GSTX | Georgia Power Co. | added 1/2005; 7/2005 | | NAKINA |
| 5593 | GSTX | Galena-Signal Co. of Texas | 7/1923 | | NAKINA |
| 5594 | GSTX | Galena-Signal Oil Co. of Texas | 8/1920 | | NAKINA |
| 5595 | GSTX | *GALENA-SIGNAL (OIL) CO. OF TEXAS | | | PWRC |
| 5596 | GSTX | +GEORGIA POWER CO. | | | PWRC |
| 5597 | GSTX | GEORGIA POWER COMPANY | | | SCAC4 |
| 5598 | GSTY | GALLEGOS & SON TRUCKING | | | SCAC4 |
| 5599 | GSUI | GREEN STAR CELLULOSE INC | | | SCAC4 |
| 5600 | GSUK | GSC TRUCKING | | | SCAC4 |
