| 1 | HU | Hainan Airlines Company Limited | ICAO: CHH, Callsign: Hainan, IATA Prefix: 880, Name changed to Hainan Airlines Holding Company Limited. IATA designator changed from HX | PRC | AVCODES |
| 2 | HU | Formosa Airlines Corp. | ICAO: FOS, Designator HU recalled by IATA. Formerly Yung Shing Airlines | RC | AVCODES |
| 3 | HU | Central Airlines (Nigeria) Limited. | ICAO: SEN, Callsign: Hotel Uniform, | WAN | AVCODES |
| 4 | HU | Hainan Airlines Holding Company Limited | ICAO: CHH, Callsign: Hainan, IATA Prefix: 880, Name changed from Hainan Airlines Company Limited. IATA designator changed from HX | PRC | AVCODES |
| 5 | HU | HUPAC SpA | | IT | VKM |
| 6 | HUA | Humber Aviation Ltd. | Callsign: Humber Air, | GB | AVCODES |
| 7 | HUAC | HUDSON ARMORED CAR & | | | SCAC4 |
| 8 | HUAF | HUA FENG (USA) LOGISTICS INC | | | SCAC4 |
| 9 | HUAI | HUNDER, MYLES | | | SCAC4 |
| 10 | HUAL | HUB AIRLINES INC | | | SCAC4 |
| 11 | HUAN | HUB CITY ATLANTA TERMINALS INC | | | SCAC4 |
| 12 | HUAU | HOEGH/UGLAND AUTOLINERS (HUAL) | | | SCAC1 |
| 13 | HUAU | HOEGH/UGLAND AUTO LINERS, A/S | | | SCAC4 |
| 14 | HUAV | HUNTER, AVERIL | | | SCAC4 |
| 15 | HUAX | Huasteca Petroleum Co. | 7/1930-4/1938 | | NAKINA |
| 16 | HUAX | Huasteca Petroleum Co. | Apr-38 | | NRHS |
| 17 | HUAX | HUASTECA PETROLEUM CO. | | | PWRC |
| 18 | HUB | Hub Airlines, Inc. | Callsign: Hub, | USA | AVCODES |
| 19 | HUB | Hub Airlines | | | ICAO1 |
| 20 | HUB | HUDSON BUS LINES | | | SCAC4 |
| 21 | HUBA | Hudson Bay | 1/1975-1/1980 | | NAKINA |
| 22 | HUBA | Hudson Bay | 1/75-1/80 | | NRHS |
| 23 | HUBA | BURLINGTON NORTHERN & SANTA FE RWY (BNSF) [HUDSON BAY CO. RR] | | | PWRC |
| 24 | HUBA | Hudson Bay (BNSF Railway) | | | RSRV |
| 25 | HUBB | HUB COMPUTER SOLUTIONS | | | SCAC4 |
| 26 | HUBD | HUB DISPLAYWORKS INC | | | SCAC4 |
| 27 | HUBERT | J. Hubert GmbH | | D | TRAFFIC |
| 28 | HUBF | HUB FREIGHT USA INC | | | SCAC4 |
| 29 | HUBG | HUDSON, BILLIE G | | | SCAC4 |
| 30 | HUBM | HUBBARD, BOB HORSE TRANSPORTATION I | | | SCAC4 |
| 31 | HUBO | HUB CITY TERMINALS INC | | | SCAC4 |
| 32 | HUBP | HUB INC | | | SCAC4 |
| 33 | HUBS | HUBBARDS TRANSPORTATION COMPANY | | | SCAC4 |
| 34 | HUBX | Hubbard Creamery Co. (North Western Refrigerator Line Co.) | 7/1935 | | NAKINA |
| 35 | HUBZ | HUBINGER COMPANY | | | PWRC |
| 36 | HUBZ | HUB GROUP INC | | | SCAC4 |
| 37 | HUC | Aerolineas de Tehuacan, S.A. de C.V. | Callsign: Lineas Tehuacan, | MEX | AVCODES |
| 38 | HUC | Aerloineas de Techuacan | | | ICAO1 |
| 39 | HUCA | HUTCHISON CARGO TERMINAL INC | | | SCAC4 |
| 40 | HUCE | HUTCHENS TRUCKING COMPANY INC | | | SCAC4 |
| 41 | HUCL | HUB CITY OF LOUISIANA TERMINALS INC | | | SCAC4 |
| 42 | HUCT | HUTCH TRANSPORTATION | | | SCAC4 |
| 43 | HUCX | Huron Portland Cement Co. | 7/1935-4/1961 | | NAKINA |
| 44 | HUCX | Huron Portland Cement Co. | 4/38-4/61 | | NRHS |
| 45 | HUCX | HURON PORTLAND CEMENT CO. | | | PWRC |
| 46 | HUCZ | HURON CHEMICAL | | | PWRC |
| 47 | HUD | Horizons Unlimited | Callsign: Hud, | USA | AVCODES |
| 48 | HUD | Air Hudik AB | Callsign: Air Hudik, | S | AVCODES |
| 49 | HUD | Horizons Unlimited | | | ICAO1 |
| 50 | HUDB | HUDSONS BAY COMPANY | | | SCAC4 |
| 51 | HUDC | HOUSTON DISTRIBUTING COMPANY INC | | | SCAC4 |
| 52 | HUDCB | | | GB | TRAFFIC |
| 53 | HUDCT | Huddersfield Corporation Transport | | GB | TRAFFIC |
| 54 | HUDG | HOUSTON, DOUG L | | | SCAC4 |
| 55 | HUDK | HUNTLAND TRUCKING | | | SCAC4 |
| 56 | HUDL | HUSKER DISTRIBUTION INC | | | SCAC4 |
| 57 | HUDM | HUDSON, GAY, MOVING AND STORAGE COM | | | SCAC4 |
| 58 | HUDMAN | Hudson & Manhattan | City: New York | USA | TRAFFIC |
| 59 | HUDN | HUDSON TRUCKING | | | SCAC4 |
| 60 | HUDR | HUDDLESTON, TROY TRUCKING LLC | | | SCAC4 |
| 61 | HUDS | HUDSON TRANSPORTATION CO INC | | | SCAC4 |
| 62 | HUDT | HUDINI TRANSPORTATION LTD | | | SCAC4 |
| 63 | HUDT | Hudson Transit | | US-NJ | TRAFFIC |
| 64 | HUDX | Hudson Technologies, Inc. | 7/2000-7/2005 (not listed) | | NAKINA |
| 65 | HUDX | Hudson Technologies, Inc. | Jul-00 | | NRHS |
| 66 | HUDX | HUDSON TECHNOLOGIES INC | | | PWRC |
| 67 | HUDX | Hudson Technologies | | | RSRV |
| 68 | HUE | Haute Aviation | Callsign: Haute, | CH | AVCODES |
| 69 | HUEL | HUENEMAN LOGISTICS LC | | | SCAC4 |
| 70 | HUF | Hungarian Air Force | Callsign: Hungarian Airforce, | H | AVCODES |
| 71 | HUF | Hungarian Air Force | | | ICAO1 |
| 72 | HUFF | HUFFMAN TRUCKING | | | SCAC4 |
| 73 | HUFM | HUFFMAN, SCOTT | | | SCAC4 |
| 74 | HUFO | HUFFMAN OIL COMPANY INC | | | SCAC4 |
| 75 | HUGE | HUGUENOT ENERGY LLC | | | SCAC4 |
| 76 | HUGG | HUGGHINS TRANSPORTATION INC | | | SCAC4 |
| 77 | HUGH | HUGHES TRUCKING INC | | | SCAC4 |
| 78 | HUGI | HUDGINS TRUCKING INC | | | SCAC4 |
| 79 | HUGM | HUGO MESSENGER SERVICE INC | | | SCAC4 |
| 80 | HUGR | HURTIGRUTEN ASA | | | SCAC4 |
| 81 | HUGS | HUGHES TRUCKING & CONTRACTING | | | SCAC4 |
| 82 | HUGU | HUBE GLOBAL CO LTD | | | SCAC4 |
| 83 | HUHB | HUGHES BROTHERS TRANSPORTATION, INC | | | SCAC1 |
| 84 | HUHB | HUGHES BROTHERS TRANSPORTATION INC | | | SCAC4 |
| 85 | HUHE | HUGHES BROS INC | | | SCAC4 |
| 86 | HUHL | HUGHES & HILL INC | | | SCAC4 |
| 87 | HUI | Aero Huilango, S.A. de C.V. | Callsign: Huilango, | MEX | AVCODES |
| 88 | HUJC | HUNT, J C COMPANY INC | | | SCAC4 |
| 89 | HUK | Hungarian-Ukranian Airlines Ltd. | Callsign: Big Bird, | H | AVCODES |
| 90 | HUKB | Hümmlinger Kreisbahn | | D | TRAFFIC |
| 91 | HUKD | HUSKINS, D C & SONS TRUCKING | | | SCAC4 |
| 92 | HUKG | HUNTER TRUCKING INC | | | SCAC4 |
| 93 | HUKU | HUKTRA NV | | B | BIC |
| 94 | HUKU | HUKTRA (UK) LIMITED | | | PWRC |
| 95 | HUKU | Huktra | | | RSRV |
| 96 | HUKU | HUKTRA NV | | | SCAC4 |
| 97 | HULG | HULL TRUCKING INC | | | SCAC4 |
| 98 | HULJ | HULL, JOHN TRUCKING | | | SCAC4 |
| 99 | HULL | HULL TRANSPORT LTD | | | SCAC4 |
| 100 | HULL | Hull Trains | Hull Trains is a train operating company in the United Kingdom, running up to six long distance services each day between London Kings Cross and Hull, calling at Grantham, Retford, Doncaster, Selby, Howden and Brough. It is owned by First Group following the buyout of its previous parent company, GB Railways. Hull Trains is one of the three ‘open access’ rail operators in the UK, meaning that instead of owning a franchise and operating a level of service laid down by the Strategic Rail Authority, it applied for, and was awarded in 2002, access rights for 10 years by the Office of the Rail Regulator. | GB | TRAFFIC |
