| 201 | HTMA | HARTMANS TRUCKING COMPANY INC | | | SCAC4 |
| 202 | HTMC | HESS, T M LLC | | | SCAC4 |
| 203 | HTMF | HEMATITE MANUFACTURING | | | SCAC4 |
| 204 | HTML | HATSU MARINE LIMITED | | | SCAC4 |
| 205 | HTMM | HER-MAR TRANSPORT | | | SCAC4 |
| 206 | HTMR | HOLM, J & SONS INC | | | SCAC4 |
| 207 | HTMS | HOLLAND TRANSPORTATION MANAGEMENT S | | | SCAC4 |
| 208 | HTMU | HANSEN & TIDEMANN, INC. | | | PWRC |
| 209 | HTMU | Hansen and Tidemann | | | RSRV |
| 210 | HTMU | HANSEN & TIDEMANN INC. | | | SCAC4 |
| 211 | HTN | Haiti North Airline | | RH | AVCODES |
| 212 | HTN | Haiti North Airline | | | ICAO1 |
| 213 | HTNG | HILTNER TRUCKING | | | SCAC4 |
| 214 | HTNH | HATTENHAUER TRANSPORTATION LLC | | | SCAC4 |
| 215 | HTNI | HORTON TRUCKING INC | | | SCAC4 |
| 216 | HTNK | HEUTINK HAY CO INC | | | SCAC4 |
| 217 | HTNN | HOLT TRANSPORTATION INC | | | SCAC4 |
| 218 | HTNO | HEAT INNOVATIONS INC | | | SCAC4 |
| 219 | HTNR | HARTLEY, NATHAN TRUCKING INC | | | SCAC4 |
| 220 | HTNS | HUTTONS LIVESTOCK LTD | | | SCAC4 |
| 221 | HTO | Tango Bravo | | | ICAO1 |
| 222 | HTOA | HARMAC TRANSPORTATION INC | | | SCAC4 |
| 223 | HTOC | HERCHE TRANSFER OF COLORADO INC | | | SCAC4 |
| 224 | HTOD | HAMILTON SOD | | | SCAC4 |
| 225 | HTOG | HURRICANE TOWING | | | SCAC4 |
| 226 | HTOK | HICKS TRUCKING OF CROSS TIMBERS INC | | | SCAC4 |
| 227 | HTOL | HUNT OIL INC | | | SCAC4 |
| 228 | HTOO | HARTOG OIL CO | | | SCAC4 |
| 229 | HTOP | HOP ENERGY LLC | | | SCAC4 |
| 230 | HTP | Heli Trip, S.A. de C.V. | Callsign: Heli Trip, Ceased Operations. | MEX | AVCODES |
| 231 | HTP | Hala Air | IATA: HY, Callsign: Hala Express, IATA Designator chnaged to HG. | LAR | AVCODES |
| 232 | HTP | Hala Air | IATA: HG, Callsign: Hala Express, IATA Designator changed from HY*. | LAR | AVCODES |
| 233 | HTP | Heli Trip | | | ICAO1 |
| 234 | HTPA | HERCULES TRANSPORT INC | | | SCAC4 |
| 235 | HTPD | HILL-TOP TRANSPORTATION INC | | | SCAC4 |
| 236 | HTPE | HOST, T PARKER INC | | | SCAC4 |
| 237 | HTPN | HYTECH PRODUCTION LTD | | | SCAC4 |
| 238 | HTPT | HOLTEN TRANSPORTATION INC | | | SCAC4 |
| 239 | HTPX | H. Thiessen Pickle Co. | 1/1945-10/1957; eliminated 4/1961 | | NAKINA |
| 240 | HTPX | H. Thiessen Pickle Co. | 1/52-10/57; eliminated 4/61 | | NRHS |
| 241 | HTPX | H. THIESSEN PICKLE CO. | | | PWRC |
| 242 | HTQE | HYDRO TECHNIQUE | | | SCAC4 |
| 243 | HTR | Holstenair Lubeck, Luftverkehrsservice GmbH & Co. Betriebs-KG | Callsign: Holsten, | D | AVCODES |
| 244 | HTR | Holstenair Lubeck | | | ICAO1 |
| 245 | HTRA | H & E AIR CARTAGE | | | SCAC4 |
| 246 | HTRD | HIGHLAND-TROY READY MIX MATERIAL DIVISION, INC | | | SCAC1 |
| 247 | HTRF | HANSON TRANSFER, INC | | | SCAC1 |
| 248 | HTRF | HERMES TRANSPORT | | | SCAC4 |
| 249 | HTRI | HULL TRUCKING OF MASON CITY INC | | | SCAC4 |
| 250 | HTRL | HUNTERLINE | | | SCAC4 |
| 251 | HTRM | HUNTER OIL CO INC | | | SCAC4 |
| 252 | HTRN | HUNTER TRANSPORTATION COMPANY INCOR | | | SCAC4 |
| 253 | HTRS | HTRS Süd GmbH | Neuoffingen (HTRS = Husa Transportation Railway Sevices) | D | privat-bahn.de |
| 254 | HTRS | HALTER TRANSPORTATION SERVICES INC | | | SCAC4 |
| 255 | HTRSN | HTRNS Nederland bv | | NL | VKM |
| 256 | HTRT | HERNANDEZ TRUCKING | | | SCAC4 |
| 257 | HTRU | HARDY TANK LTD | | RUS | BIC |
| 258 | HTRW | HOLLAND TRUCKING | | | SCAC4 |
| 259 | HTRX | Houston Terminal Refining Co. | 7/1923-7/1930 | | NAKINA |
| 260 | HTRX | HOUSTON TERMINAL REFINING CO. | | | PWRC |
| 261 | HTS | Helitrans Air Service, Inc. | Callsign: Helitrans, | USA | AVCODES |
| 262 | HTS | Helistar S.A.S. | Callsign: Helisas, | CO | AVCODES |
| 263 | HTS | Helitrans Air Service | | | ICAO1 |
| 264 | HTSB | HAVE TRANSPORT SOLUTIONS CORPORATIO | | | SCAC4 |
| 265 | HTSE | HUNTLEY ENTERPRISES S A | | | SCAC4 |
| 266 | HTSG | HAITI SHIPPING LINES INC | | | SCAC4 |
| 267 | HTSH | HIRSCHBACH TRANSPORTATION SERVICES | | | SCAC4 |
| 268 | HTSJ | HITACHI TRANSPORT SYSTEM LTD | | | SCAC4 |
| 269 | HTSL | HYNDMAN TRANSPORT (1972) LIMITED | | | SCAC4 |
| 270 | HTSM | HOT SHOT DELIVERY SERVICE INC | | | SCAC4 |
| 271 | HTSN | HUNTERS TRUCKING SERVICES INC | | | SCAC4 |
| 272 | HTSO | HART STUDIOS INC | | | SCAC4 |
| 273 | HTSP | HUNTER TRANSPORT LTD | | | SCAC4 |
| 274 | HTSQ | HILLDRUP MOVING & STORAGE | | | SCAC4 |
| 275 | HTSU | HTS LLC | | RUS | BIC |
| 276 | HTSU | HIGH TECH TRANSPORT LTD. | | | PWRC |
| 277 | HTSU | High Tech Transport | | | RSRV |
| 278 | HTSU | HIGH TECH TRANSPORT, LTD | | | SCAC4 |
| 279 | HTSV | HORNUNG TRUCKING SERVICE, Manning Distribution Services, INC | | | SCAC1 |
| 280 | HTSV | HORNUNGS TRUCKING SERVICE | | | SCAC4 |
| 281 | HTSX | Herzog Transit Services, Inc. | 7/2005 (not listed) | | NAKINA |
| 282 | HTSX | HERZOG TRANSIT SERVICES, INC. | | | PWRC |
| 283 | HTSX | Herzog Transit Services | | | RSRV |
| 284 | HTSX | HERZOG TRANSIT SERVICES INC | | | SCAC4 |
| 285 | HTT | Air Tchad, Société de Transports Aériens | IATA: HT, Callsign: Hotel Tango, Designator HT recalled by IATA | TCH | AVCODES |
| 286 | HTT | Air Tchad | | | ICAO1 |
| 287 | HTTA | HATTA ENTERPRISES LTD | | | SCAC4 |
| 288 | HTTB | HIGH TOWER TRANSPORTATION BROKERAGE | | | SCAC4 |
| 289 | HTTD | HIGH TECH TRANSPORTATION INC | | | SCAC4 |
| 290 | HTTG | HALL, TREVOR TRUCKING | | | SCAC4 |
| 291 | HTTH | HATTENHAUER DISTRIBUTING CO | | | SCAC4 |
| 292 | HTTI | HEARTLAND TRANSPORTATION INC | | | SCAC4 |
| 293 | HTTM | HAMMOND TRANSPORTATION INC | | | SCAC4 |
| 294 | HTTN | HART TRUCKING INC | | | SCAC4 |
| 295 | HTTP | HILL TOP TRUCKING | | | SCAC4 |
| 296 | HTTQ | HI-TECH TRUCKING INC. | | | SCAC4 |
| 297 | HTTS | HOUNDSTOOTH TRANSPORTATION INC | | | SCAC4 |
| 298 | HTTT | HUNT TRANSPORT INC | | | SCAC4 |
| 299 | HTTV | HANLEY, TIM TRUCKING LLC | | | SCAC4 |
| 300 | HTTW | HITTSON TRANSPORT INC | | | SCAC4 |
