| 4201 | HPTF | HIGH PERFORMANCE TRANSPORT AND SHIP | | | SCAC4 |
| 4202 | HPTG | HOFFMAN, PAUL TRUCKING INC | | | SCAC4 |
| 4203 | HPTI | HOPE TRUCKING INC | | | SCAC4 |
| 4204 | HPTJ | HIGH PLAINS TRUCKING LLC | | | SCAC4 |
| 4205 | HPTL | HIGH POOL TANKERS LIMITED | | | SCAC4 |
| 4206 | HPTN | HOOPERS TRUCKING LLC | | | SCAC4 |
| 4207 | HPTO | HULSEY PROPANE TRANSPORT INC | | | SCAC4 |
| 4208 | HPTP | HP TRANSPORT INC | | | SCAC4 |
| 4209 | HPTU | HIGHWAY PIPELINE | | | PWRC |
| 4210 | HPTU | Highway Pipeline | | | RSRV |
| 4211 | HPTX | Hellbron-Palmer Tank Line Co. | 7/1923 | | NAKINA |
| 4212 | HPTX | HELLBRON-PALMER TANK LINE CO. | | | PWRC |
| 4213 | HPUT | HEREM, PAUL TRUCKING | | | SCAC4 |
| 4214 | HPUZ | HOUSTON PUBLIC ELEVATOR | | | PWRC |
| 4215 | HPWN | HOFER, PAUL WAYNE | | | SCAC4 |
| 4216 | HPX | Houston Packing Co. | 8/1920-1/1952; eliminated 7/1953 | | NAKINA |
| 4217 | HPX | Houston Packing Co. | 4/38-1/52 | | NRHS |
| 4218 | HPX | HOUSTON PACKING CO. | | | PWRC |
| 4219 | HPXC | H P TRANSPORTATION INC | | | SCAC4 |
| 4220 | HPXL | HILLPOINT EXPRESS LLC | | | SCAC4 |
| 4221 | HPY | Happy Air Travellers Co., Ltd | Callsign: Happy Travel, | T | AVCODES |
| 4222 | HPYW | HAPPY WORLD TRANSPORT | | | SCAC4 |
| 4223 | HQ | HMY Airways, Inc. | ICAO: HMY, Callsign: Harmony, Name changed to HMY Airways, Inc. d/b/a Harmony Airways | CDN | AVCODES |
| 4224 | HQ | Business Express Airlines, Inc. | ICAO: GAA, Callsign: Bizex, Ceased operations on 03 December 2000. Name changed from Atlantic Air | USA | AVCODES |
| 4225 | HQ | Hawker Siddeley Aviation Ltd. | Callsign: Hawkair, | GB | AVCODES |
| 4226 | HQ | British Aerospace Plc | ICAO: BAE, Callsign: BAE, Designator HQ recalled by IATA. Name changed to BAE Systems | GB | AVCODES |
| 4227 | HQ | HMY Airways, Inc. d/b/a Harmony Airways | ICAO: HMY, Callsign: Harmony, Founded in 2002. Ceased operationon 09 April 2007. Name changed from HMY Airways, Inc. | CDN | AVCODES |
| 4228 | HQ | Thomas Cook Airline Belgium N.V. | ICAO: TCW, Callsign: Thomas Cook, Name changed to VLM Airlines N.V. IATA designator changed from FQ* | B | AVCODES |
| 4229 | HQ | VLM Airlines N.V. | ICAO: TCW, Callsign: Phoenix, Name changed from Thomas Cook Airline Belgium N.V. IATA designator changed from FQ* | B | AVCODES |
| 4230 | HQ | Sino-Lac Air | Designator HQ recalled by IATA | TL | AVCODES |
| 4231 | HQ | Compass Cargo Airlines Ltd. | ICAO: ADZ, Callsign: Migrator, Name changed from Avio Delta Ltd. | BG | AVCODES |
| 4232 | HQA | Quick Air-Trans Ltd. | Callsign: Willy Trans, | H | AVCODES |
| 4233 | HQCN | HIGH QUALITY CONTAINERS TRANSPORT I | | | SCAC4 |
| 4234 | HQFT | HOLMES Q S T INC | | | SCAC4 |
| 4235 | HQID | HORIZON INTERNATIONAL DISTRIBUTORS | | | SCAC4 |
| 4236 | HQLQ | HYBRID LOGISTICS SOLUTIONS INC | | | SCAC4 |
| 4237 | HQLT | HART, L T INC | | | SCAC4 |
| 4238 | HQMT | HQ MARINE TRANSPORT INC | | | SCAC4 |
| 4239 | HQO | Avinor AS | | N | AVCODES |
| 4240 | HQO | Avinor | | | ICAO1 |
| 4241 | HQOI | HICKMAN OIL & ICE CO INC | | | SCAC4 |
| 4242 | HQPC | HOOD PETROLEUM CO INC | | | SCAC4 |
| 4243 | HQSL | HEAVYQUIP SALES LTD | | | SCAC4 |
| 4244 | HQTA | HORN, QUINCE TRANSPORT | | | SCAC4 |
| 4245 | HQTL | HANNIBAL-QUINCY TRUCK LINES | | | PWRC |
| 4246 | HQUC | HYDRO-QUEBEC | | | SCAC4 |
| 4247 | HR | Hahn Air Lines | ICAO: HHN, Callsign: Rooster, IATA Prefix: 169, IATA designator changed to HR. Change of name from Hahn Air Businessline | D | AVCODES |
| 4248 | HR | Hahn Air Gmbh & Co. Kg. | ICAO: HHN, Callsign: Rooster, IATA Prefix: 169, Change of name to Hahn Air Businessline | D | AVCODES |
| 4249 | HR | Air Bremen GmbH & Co. Luftverkehrs KG | ICAO: BRN, Callsign: Air Bremen, | D | AVCODES |
| 4250 | HR | Hahn Air Businessline | ICAO: HHN, Callsign: Rooster, IATA Prefix: 169, Change of name from Hahn Air Gmbh & Co. Kg. Name changed to Hahn Air Lines | D | AVCODES |
| 4251 | HR | TAR | | RA | AVCODES |
| 4252 | HR | Hahn Air Lines | ICAO: HHN, Callsign: Rooster, IATA Prefix: 169, IATA designator changed from HR*. Change of name from Hahn Air Businessline | D | AVCODES |
| 4253 | HR | Heritage R.R. Corp. | added 1/2004; eliminated 7/2004; 7/2005 | | NAKINA |
| 4254 | HR | HERITAGE RAILROAD CORP. | | | PWRC |
| 4255 | HR | HERITAGE RAILROAD CORP | | | SCAC4 |
| 4256 | HRA | Heli-Iberica, S.A. | Callsign: Erica, | E | AVCODES |
| 4257 | HRA | Heli-Iberica | | | ICAO1 |
| 4258 | HRAA | HAYNES TRANSPORT | | | SCAC4 |
| 4259 | HRAB | HARMAC REBAR & STEEL CORP | | | SCAC4 |
| 4260 | HRAC | HAMILTON, RAY, COMPANY, THE | | | SCAC1 |
| 4261 | HRAC | HAMILTON, RAY COMPANY, THE | | | SCAC4 |
| 4262 | HRAF | HESTER, R F | | | SCAC4 |
| 4263 | HRAI | HIERO, ARTISTICO S A DE C V | | | SCAC4 |
| 4264 | HRAIL | Eiffage Rail GmbH | | DE | VKM |
| 4265 | HRAJ | HRA | | | SCAC4 |
| 4266 | HRAK | HARKER RANCH | | | SCAC4 |
| 4267 | HRAN | HARRIS, J A TRUCKING | | | SCAC4 |
| 4268 | HRAO | HAMBURG RADIATOR AUTO & AIR | | | SCAC4 |
| 4269 | HRAR | HARVIE RANCHING | | | SCAC4 |
| 4270 | HRAY | HAND, RAY R | | | SCAC4 |
| 4271 | HRB | Haiti International Airline | IATA: HG, Callsign: Haiti Airline, IATA Prefix: 138, | RH | AVCODES |
| 4272 | HRB | Haiti International Airline | | | ICAO1 |
| 4273 | HRBA | HARBOR AUTO TRANSPORT INC | | | SCAC4 |
| 4274 | HRBG | HARDWOOD EXPRESS INC | | | SCAC4 |
| 4275 | HRBK | HERRBOLDT TRUCKING | | | SCAC4 |
| 4276 | HRBL | H & R BALING COMPANY INC | | | SCAC4 |
| 4277 | HRBQ | HARRIS RANCH BEEF COMPANY | | | SCAC4 |
| 4278 | HRBR | HARBOR EXPRESS INC | | | SCAC4 |
| 4279 | HRBT | HARBOR TRANSPORT INC | | | SCAC4 |
| 4280 | HRC | South Atlantic Airways | Callsign: Verdino, ICAO designator changed from CEE | E | AVCODES |
| 4281 | HRC | HISTORICAL RAILROAD CARS | | | PWRC |
| 4282 | HRCA | HERCORP TRANSPORT INC | | | SCAC4 |
| 4283 | HRCB | HAMBURG REEFER CHARTERING GMBH | | | SCAC4 |
| 4284 | HRCD | HOT ROD CORNER PARTS AND ACCESSORIE | | | SCAC4 |
| 4285 | HRCF | HERCULES FORWARDING, INC | | | SCAC1 |
| 4286 | HRCF | HERCULES FORWARDING INC | | | SCAC4 |
| 4287 | HRCG | HARDIES FRUIT & VEGETABLE CO INC | | | SCAC4 |
| 4288 | HRCH | HAR-G TRANSPORT | | | SCAC4 |
| 4289 | HRCK | COOK, H R TRUCK LINE, INC | | | SCAC3 |
| 4290 | HRCO | HARCO CARRIERS INC | | | SCAC4 |
| 4291 | HRCS | HAMPTON ROADS CRANE & RIGGING COMPA | | | SCAC4 |
| 4292 | HRCU | GEFCO FORWARDING (NETHERLANDS) BV | | NL | BIC |
| 4293 | HRCU | CUBA RON S A | | | SCAC4 |
| 4294 | HRCX | Heritage Railcar | 1/1994-7/2005 (not listed) | | NAKINA |
| 4295 | HRCX | Heritage Railcar | 1/94-7/2000 | | NRHS |
| 4296 | HRCX | HERITAGE RAILCAR | | | PWRC |
| 4297 | HRCX | Heritage Railcar | | | RSRV |
| 4298 | HRCX | HERITAGE RAILCAR | | | SCAC4 |
| 4299 | HRD | Marshall University Bill Noe Flight School | Callsign: Marshall Herd, | USA | AVCODES |
| 4300 | HRDD | HARTS RAPID DELIVERY | | | SCAC4 |
