| 4601 | GPTL | GROUPE TRANSPORT PAUL LESSARD (1982 | | | SCAC4 |
| 4602 | GPTM | GPT INC | | | SCAC4 |
| 4603 | GPTQ | G P G TRANSPORTATION LTD | | | SCAC4 |
| 4604 | GPTR | GRUPO TRANSPORTISTA HG | | | SCAC4 |
| 4605 | GPTX | Glenn-Pool Tank Line Co. | 8/1920 | | NAKINA |
| 4606 | GPTX | GLENN=POOL TANK LINE CO. | | | PWRC |
| 4607 | GPTY | GROUPE TRANSFER INC | | | SCAC4 |
| 4608 | GPUX | GPU Service Corp. | added 7/1981; 1/1994-7/2000; eliminated 1/2002; 7/2005 (not listed) | | NAKINA |
| 4609 | GPUX | GPU Service Corp. | added 7/81; 1/94-7/2000 | | NRHS |
| 4610 | GPUX | GPU SERVICE CORPORATION | | | PWRC |
| 4611 | GPUX | GPU Service Corporation | | | RSRV |
| 4612 | GPVN | GAPVAX INC | | | SCAC4 |
| 4613 | GPVU | BALTPLUS-REGION | | RUS | BIC |
| 4614 | GPVU | KONTAINERNIYE PEREVOZKI LTD | | | SCAC4 |
| 4615 | GPWR | GE BETZ | | | SCAC4 |
| 4616 | GPWS | GENERAC POWER SYSTEMS | | | SCAC4 |
| 4617 | GPWX | Georgia-Pacific LLC | added 4/2007 | | NAKINA |
| 4618 | GPWX | Georgia-Pacific Corp.—Wood and Fiber Procurement | added 4/2005; 7/2005; eliminated 4/2007 | | NAKINA |
| 4619 | GPWX | GEORGIA-PACIFIC LLC | | | PWRC |
| 4620 | GPWX | GEORGIA-PACIFIC CORPORATION-WOOD AN | | | SCAC4 |
| 4621 | GPX | GP Aviation E.o.o.d. | IATA: IV, Callsign: Ivory, | BG | AVCODES |
| 4622 | GPX | The Glidden Co., Naval Stores Division | 4/1947-4/1961; eliminated 10/1963 | | NAKINA |
| 4623 | GPX | Georgia Pine Turpentine Co. | 7/1923-1/1943 | | NAKINA |
| 4624 | GPX | Southern Pine Chemical Co., Division of the Glidden Co. | 1/1945-1/1946 | | NAKINA |
| 4625 | GPX | Georgia Pine Turpentine Co. of New York | 8/1920 | | NAKINA |
| 4626 | GPX | Georgia Pine Turpentine Co. | Apr-38 | | NRHS |
| 4627 | GPX | The Glidden Co., Naval Stores Division | 1/52-4/61 | | NRHS |
| 4628 | GPX | GLIDDEN CO., NAVAL STORES DIV. [SOUTHERN PINE CHEMICAL CO.; GEORGIA PINE TURPENTINE CO.] | | | PWRC |
| 4629 | GPXC | G P EXPRESS | | | SCAC4 |
| 4630 | GPXL | G PROULX LLC | | | SCAC4 |
| 4631 | GPXQ | GP TRANS INC | | | SCAC4 |
| 4632 | GPXS | GP XPRESS | | | SCAC4 |
| 4633 | GPXT | G P EXPRESS TRUCKING INC | | | SCAC4 |
| 4634 | GPYI | GLOBAL POLYMERS LLC | | | SCAC4 |
| 4635 | GQ | Big Sky Airlines | ICAO: BSY, Callsign: Big Sky, IATA Prefix: 387, Designator GQ recalled by IATA | USA | AVCODES |
| 4636 | GQ | General Air | | D | AVCODES |
| 4637 | GQ | Druk Air | Callsign: Druk, | BTN | AVCODES |
| 4638 | GQ | Sky Express S.A. | ICAO: SEH, Callsign: Air Crete, IATA Designator changed from G3* | GR | AVCODES |
| 4639 | GQ | Guardian Flight, Inc. | | USA | AVCODES |
| 4640 | GQBL | GOD BLESS TRUCKING | | | SCAC4 |
| 4641 | GQBT | GLOBAL TRADING RESOURCES INC | | | SCAC4 |
| 4642 | GQCN | GRIND LOGISTICS CORPORATION | | | SCAC4 |
| 4643 | GQGI | GTR LOGISTICS INC | | | SCAC4 |
| 4644 | GQLC | GRACE LOGISTICS LLC | | | SCAC4 |
| 4645 | GQLI | GREAT LAKES CONNECTION INC | | | SCAC4 |
| 4646 | GQLK | GREAT LAKES | | | SCAC4 |
| 4647 | GQMI | GRAEBEL QUALITY MOVERS | | | SCAC4 |
| 4648 | GQNT | GREEN TRANSPORTATION INC | | | SCAC4 |
| 4649 | GQST | GRANITE STATE TRANSPORTATION | | | SCAC4 |
| 4650 | GQTB | GORDON TRUCKING INC (QUAKER TRIP BI | | | SCAC4 |
| 4651 | GQTC | GTC LOGISTICS INC | | | SCAC4 |
| 4652 | GQTI | GATOR TRANSPORTATION INC | | | SCAC4 |
| 4653 | GR | Aurigny Air Services Limited | ICAO: AUR, Callsign: Ayline, IATA Prefix: 924, | GBG | AVCODES |
| 4654 | GR | Gemini Air Cargo LLC | ICAO: GCO, Callsign: Gemini, IATA Prefix: 358, Ceased operations on 12 August 2008 | USA | AVCODES |
| 4655 | GR | Grand Rapids Eastern R.R., Inc. | 1/1994; added 10/1994; 7/2000; eliminated 4/2005; 7/2005 | | NAKINA |
| 4656 | GR | Grasse River R.R. | 4/1938-7/1965 | | NAKINA |
| 4657 | GR | Grasse River R.R. Corp. | 7/1923-7/1936 | | NAKINA |
| 4658 | GR | Grasse River R.R. | 4/38-7/65 | | NRHS |
| 4659 | GR | Grand Rapids Eastern R.R., Inc. | 1/94; added 10/94; 7/2000 | | NRHS |
| 4660 | GR | GRAND RAPIDS EASTERN RAILROAD INC. [GRASSE RIVER RR] | | | PWRC |
| 4661 | GR | Grand Rapids Eastern Railroad | | | RSRV |
| 4662 | GR | GRAND RAPIDS EASTERN RAILROAD INC | | | SCAC4 |
| 4663 | GR | Chemins de fer de Géorgie | | GE | VKM |
| 4664 | GRA | Great American Airways | Callsign: Great American, AOC revoked on 13 April 1997. | USA | AVCODES |
| 4665 | GRA | Guardian Air Asset Management (Pty) Ltd. | Callsign: Flex, | ZA | AVCODES |
| 4666 | GRA | Great American Airways | | | ICAO1 |
| 4667 | GRA | GRAY LINE COMPANY, THE | | | SCAC4 |
| 4668 | GRAA | GRASS, M E & SONS INC | | | SCAC4 |
| 4669 | Graf MEC | Grafschafter Modell-Eisenbahnclub e.V. | Nordhorn | D | privat-bahn.de |
| 4670 | GRAG | Ing. Greuter AG | | CH | VKM |
| 4671 | GRAH | GREAT AMERICAN MOVERS (A CORPORATIO | | | SCAC4 |
| 4672 | GRAJ | GARCIA ALEGRIA, ROBERTO | | | SCAC4 |
| 4673 | GRAK | GARCHA, D TRUCKING LTD | | | SCAC4 |
| 4674 | GRAM | GRAHAM SHIP BY TRUCK COMPANY | | | SCAC1 |
| 4675 | GRAN | Greater Anglia | | GB | TRAFFIC |
| 4676 | GRAN | Bauunternehmung Granit GmbH | | AT | VKM |
| 4677 | GRAQ | GRANITE CREATIONS INC | | | SCAC4 |
| 4678 | GRAS | GROSHELL TRANSPORTATION SERVICES IN | | | SCAC4 |
| 4679 | GRAS | Grenland rail AS | | NO | VKM |
| 4680 | GRAV | GUTIERREZ AVALOS, ALFONSO | | | SCAC4 |
| 4681 | GRAW | GRAY, GARY W | | | SCAC1 |
| 4682 | GRAX | Grax Corp. | added 7/1965; 7/1965-10/1966; eliminated 7/1968 | | NAKINA |
| 4683 | GRAX | Grax Corp. | added 7/65; 7/65-10/66; eliminated 7/68 | | NRHS |
| 4684 | GRAX | GRAX CORP. | | | PWRC |
| 4685 | GRAX | GRAYMONT (PA) INC | | | SCAC4 |
| 4686 | GRAY | Gray Coach Lines | | CDN | TRAFFIC |
| 4687 | GRB | Phoenix Air Group, Inc. | IATA: PH, Callsign: Gray Bird, ICAO Designator changed from PHA. | USA | AVCODES |
| 4688 | GRBA | GRANIT DIRECT | | | SCAC4 |
| 4689 | GRBC | GIBLETT FARM & RANCH LTD | | | SCAC4 |
| 4690 | GRBH | G R T TRUCKING | | | SCAC4 |
| 4691 | GRBI | GARAGE RENE BERTRAND INC | | | SCAC4 |
| 4692 | GRBJ | GRANTON TRAILERS LIMITED | | | SCAC4 |
| 4693 | GRBL | GREENBELT TRANSPORT | | | SCAC4 |
| 4694 | GRBP | GRACE ROAD LINES LTD | | | SCAC4 |
| 4695 | GRBR | GFI TRANSPORT.COM | | | SCAC4 |
| 4696 | GRBT | GRAINBELT TRANSPORT LTD | | | SCAC4 |
| 4697 | GRBU | GOODRICH MARITIME PRIVATE LIMITED | | IND | BIC |
| 4698 | GRBV | GREAT NORTHERN MODELS | | | SCAC4 |
| 4699 | GRC | Grace Flight Of America, Inc. | Callsign: Grace Flight, | USA | AVCODES |
| 4700 | GRC | GLASGOW RAILWAY CO. | | | PWRC |
