| 1 | GY | Guyana Airways d/b/a Guyana Airways 2000 Inc. | ICAO: GYA, Callsign: Guyair, IATA Prefix: 206, | GUY | AVCODES |
| 2 | GY | Tri-MG Intra Asia Airlines, PT. | ICAO: TMG, Callsign: Trilines, Designator GY recalled by IATA | RI | AVCODES |
| 3 | GY | Guyana Airways Corporation | Callsign: Guyair, IATA Prefix: 206, Ceased operations | GUY | AVCODES |
| 4 | GY | Gabon Airlines | | G | AVCODES |
| 5 | GY | Guyana Airways Corporation | ICAO: GYA, Callsign: Guyair, | GUY | AVCODES |
| 6 | GY | Colorful GuiZhou Airlines Co., Ltd | ICAO: CGZ, Callsign: Colorful, IATA Prefix: 661, Founded on 19 June 2015. Commenced operations on 31 December 2015. | PRC | AVCODES |
| 7 | GY | GySEV/ROeEE | | H | TRAFFIC |
| 8 | GYA | Guyana Airways d/b/a Guyana Airways 2000 Inc. | IATA: GY, Callsign: Guyair, IATA Prefix: 206, | GUY | AVCODES |
| 9 | GYA | Guyana Airways Corporation | IATA: GY, Callsign: Guyair, | GUY | AVCODES |
| 10 | GYAC | GOZZARD YACHTS | | | SCAC4 |
| 11 | GYAN | GUAYAHNOS SA DE CV | | | SCAC4 |
| 12 | GYAS | GULF FREIGHT SYSTEMS LLC | | | SCAC4 |
| 13 | GYAW | GRINYER, MICHAEL STABLES | | | SCAC4 |
| 14 | GYC | GySEV Cargo | | H | TRAFFIC |
| 15 | GYC | GYSEV Cargo Zrt | | HU | VKM |
| 16 | GYCA | GRAY CARRIERS INC | | | SCAC4 |
| 17 | GYCT | GRAY'S COMMODITIES TRUCKING, INC | | | SCAC1 |
| 18 | GYCT | GYPSY ROSE TRANSPORT | | | SCAC4 |
| 19 | GYDB | GATEWAY DISTRIBUTION | | | SCAC4 |
| 20 | GYDC | GREENLYS DELIVERY & COURIER SERVICE | | | SCAC4 |
| 21 | GYDN | GRAY, DENIS TRUCKING INC | | | SCAC4 |
| 22 | GYDT | GROCERY DIRECT CONSOLIDATED TRANSPO | | | SCAC4 |
| 23 | GYDV | GREAT AMERICAN DELIVERY SERVICE INC | | | SCAC4 |
| 24 | GYEP | GALLOWAY ENTERPRISES | | | SCAC4 |
| 25 | GYFI | GRAYBILL FARMS INC | | | SCAC4 |
| 26 | GYG | Serviceair | Callsign: Natakhtari, | GE | AVCODES |
| 27 | GYGO | GREY GOOSE LOGISTICS | | | SCAC4 |
| 28 | GYHC | GENERAL DELIVERY | | | SCAC4 |
| 29 | GYHI | GLOBAL YACHT HAULING INC | | | SCAC4 |
| 30 | GYKL | GLORY LOGISTICS INC | | | SCAC4 |
| 31 | GYLG | GARRICK CONTRACT CARRIERS INC | | | SCAC4 |
| 32 | GYLI | GREYLINE INSTRUMENTS INC | | | SCAC4 |
| 33 | GYLR | GRAY-LINE TRUCKING | | | SCAC4 |
| 34 | GYLT | GRAY LINE TOURS CHICAGO | | | SCAC4 |
| 35 | GYLX | Gaylord Container Corp. | 7/2005 (not listed) | | NAKINA |
| 36 | GYLX | GAYLORD CONTAINER CORP. | | | PWRC |
| 37 | GYLX | Gaylord Container Corporation | | | RSRV |
| 38 | GYLY | GARY, LARRY TRUCKING INC | | | SCAC4 |
| 39 | GYM | Gyumru Aviaughiner | Callsign: Gyumru Avia, | AM | AVCODES |
| 40 | GYMI | GUY, MIKE, TRUCKING | | | SCAC1 |
| 41 | GYMO | GARTTMEYER MOVING & STORAGE INC | | | SCAC4 |
| 42 | GYMS | GASTLEYS MOVING & STORAGE | | | SCAC4 |
| 43 | GYMZ | GAY MINE | | | PWRC |
| 44 | GYNA | GRIMALDO YANEZ, NADIA ALICIA | | | SCAC4 |
| 45 | GYNC | GUYTON, CLEMASEE | | | SCAC4 |
| 46 | GYOD | GUAJARDO, YOLANDA | | | SCAC4 |
| 47 | GYON | Gyöngyösi kisvasút | Real: H-MAEV | H | TRAFFIC |
| 48 | GYP | Eagle Aviation | Callsign: Gypsy, | GB | AVCODES |
| 49 | GYP | Eagle Aviation | | | ICAO1 |
| 50 | GYPD | GYPSUM EXPRESS LTD (DEDICATED DIVIS | | | SCAC4 |
| 51 | GYPE | GYPSUM EXPRESS LTD | | | SCAC4 |
| 52 | GYPG | GRYPH GROUP, THE | | | SCAC4 |
| 53 | GYPK | GRYPHON TRUCKING INC | | | SCAC4 |
| 54 | GYPL | GYPSUM TRANSPORTATION LIMITED | | | SCAC4 |
| 55 | GYPS | GYPSTREND s.r.o. | | CZ | VKM |
| 56 | GYR | Gyrafrance | | F | AVCODES |
| 57 | GYRD | GORDYS FIREWOOD INC | | | SCAC4 |
| 58 | GYRI | GRAY, RICHARD TRUCKING LLC | | | SCAC4 |
| 59 | GYRL | GRAY, ROBERT L CO INC | | | SCAC4 |
| 60 | GYRO | GYRO-TRAC CORPORATION | | | SCAC4 |
| 61 | GYRT | GRAY RIDER TRUCK LINES INC | | | SCAC4 |
| 62 | GYSC | GUYETTE-SCHMIDT INC | | | SCAC4 |
| 63 | GYSEV | Györ-Sopron-Ebenfurti Vasut Részvénytarsasag | | HU | VKM |
| 64 | GYSN | GRAYSON SERVICE, INC | | | SCAC1 |
| 65 | GYSN | GREYSEN ENTERPRISES INC | | | SCAC4 |
| 66 | GYSS | GRYSSON OIL COMPANY INC | | | SCAC4 |
| 67 | GYST | GYPSY EXPRESS TRANSPORT INC | | | SCAC4 |
| 68 | GYTE | GARYS TAILIGHT EXPRESS INC | | | SCAC4 |
| 69 | GYTG | GAYLOR TRUCKING | | | SCAC4 |
| 70 | GYTI | GARYS TRUCKING INC | | | SCAC4 |
| 71 | GYTK | GAYTAN TRUCKING LLC | | | SCAC4 |
| 72 | GYTR | GOOD YEAR TIRE & RUBBER COMPANY, TH | | | SCAC4 |
| 73 | GYUS | GUANGYI USA | | | SCAC4 |
| 74 | GYV | Gyermekvasút (Children's Railway) | | H | TRAFFIC |
| 75 | GYWC | GOING YOUR WAY CUSTOM TRANSPORTATIO | | | SCAC4 |
| 76 | GYXC | GENESYS TRANSPORTATION CONSULTING L | | | SCAC4 |
| 77 | GYXT | GRAY TRANSPORT | | | SCAC4 |
