| 5101 | HTLC | HOMEFOLK TRANSPORTATION, LLC | | | SCAC4 |
| 5102 | HTLF | HILLMANS TRANSFER LTD | | | SCAC4 |
| 5103 | HTLI | HANNA TRUCK LINE INC | | | SCAC4 |
| 5104 | HTLJ | HTL INC | | | SCAC4 |
| 5105 | HTLN | HOLTON TRUCK LINE | | | SCAC4 |
| 5106 | HTLO | HARTT LOGISTICS | | | SCAC4 |
| 5107 | HTLQ | HTL | | | SCAC4 |
| 5108 | HTLS | HORIZON TANK LINES INC | | | SCAC4 |
| 5109 | HTLU | SHENZHEN HUITAI STEEL MANUFACTURE CO., LTD. | | PRC | BIC |
| 5110 | HTLX | Haymer Transport Leasing Co. | added 1/1970; 4/1970; eliminated 7/1971 | | NAKINA |
| 5111 | HTLX | Haymer Transport Leasing Co. | added 1/70; 4/70 | | NRHS |
| 5112 | HTLX | HAYMER TRANSPORT LEASING CO. | | | PWRC |
| 5113 | HTLY | HARTLEY TRUCKING COMPANY, INC | | | SCAC1 |
| 5114 | HTM | HTM Jet Service GmbH & Co KG | Callsign: Helitravel, Name changed to HTM Helicopter Travel | D | AVCODES |
| 5115 | HTM | HTM Helicopter Travel | Callsign: Helitravel, Name changed from HTM Jet Service GmbH & Co KG | D | AVCODES |
| 5116 | HTMA | HARTMANS TRUCKING COMPANY INC | | | SCAC4 |
| 5117 | HTMC | HESS, T M LLC | | | SCAC4 |
| 5118 | HTMF | HEMATITE MANUFACTURING | | | SCAC4 |
| 5119 | HTML | HATSU MARINE LIMITED | | | SCAC4 |
| 5120 | HTMM | HER-MAR TRANSPORT | | | SCAC4 |
| 5121 | HTMR | HOLM, J & SONS INC | | | SCAC4 |
| 5122 | HTMS | HOLLAND TRANSPORTATION MANAGEMENT S | | | SCAC4 |
| 5123 | HTMU | HANSEN & TIDEMANN, INC. | | | PWRC |
| 5124 | HTMU | Hansen and Tidemann | | | RSRV |
| 5125 | HTMU | HANSEN & TIDEMANN INC. | | | SCAC4 |
| 5126 | HTN | Haiti North Airline | | RH | AVCODES |
| 5127 | HTN | Haiti North Airline | | | ICAO1 |
| 5128 | HTNG | HILTNER TRUCKING | | | SCAC4 |
| 5129 | HTNH | HATTENHAUER TRANSPORTATION LLC | | | SCAC4 |
| 5130 | HTNI | HORTON TRUCKING INC | | | SCAC4 |
| 5131 | HTNK | HEUTINK HAY CO INC | | | SCAC4 |
| 5132 | HTNN | HOLT TRANSPORTATION INC | | | SCAC4 |
| 5133 | HTNO | HEAT INNOVATIONS INC | | | SCAC4 |
| 5134 | HTNR | HARTLEY, NATHAN TRUCKING INC | | | SCAC4 |
| 5135 | HTNS | HUTTONS LIVESTOCK LTD | | | SCAC4 |
| 5136 | HTO | Tango Bravo | | | ICAO1 |
| 5137 | HTOA | HARMAC TRANSPORTATION INC | | | SCAC4 |
| 5138 | HTOC | HERCHE TRANSFER OF COLORADO INC | | | SCAC4 |
| 5139 | HTOD | HAMILTON SOD | | | SCAC4 |
| 5140 | HTOG | HURRICANE TOWING | | | SCAC4 |
| 5141 | HTOK | HICKS TRUCKING OF CROSS TIMBERS INC | | | SCAC4 |
| 5142 | HTOL | HUNT OIL INC | | | SCAC4 |
| 5143 | HTOO | HARTOG OIL CO | | | SCAC4 |
| 5144 | HTOP | HOP ENERGY LLC | | | SCAC4 |
| 5145 | HTP | Heli Trip, S.A. de C.V. | Callsign: Heli Trip, Ceased Operations. | MEX | AVCODES |
| 5146 | HTP | Hala Air | IATA: HY, Callsign: Hala Express, IATA Designator chnaged to HG. | LAR | AVCODES |
| 5147 | HTP | Hala Air | IATA: HG, Callsign: Hala Express, IATA Designator changed from HY*. | LAR | AVCODES |
| 5148 | HTP | Heli Trip | | | ICAO1 |
| 5149 | HTPA | HERCULES TRANSPORT INC | | | SCAC4 |
| 5150 | HTPD | HILL-TOP TRANSPORTATION INC | | | SCAC4 |
| 5151 | HTPE | HOST, T PARKER INC | | | SCAC4 |
| 5152 | HTPN | HYTECH PRODUCTION LTD | | | SCAC4 |
| 5153 | HTPT | HOLTEN TRANSPORTATION INC | | | SCAC4 |
| 5154 | HTPX | H. Thiessen Pickle Co. | 1/1945-10/1957; eliminated 4/1961 | | NAKINA |
| 5155 | HTPX | H. Thiessen Pickle Co. | 1/52-10/57; eliminated 4/61 | | NRHS |
| 5156 | HTPX | H. THIESSEN PICKLE CO. | | | PWRC |
| 5157 | HTQE | HYDRO TECHNIQUE | | | SCAC4 |
| 5158 | HTR | Holstenair Lubeck, Luftverkehrsservice GmbH & Co. Betriebs-KG | Callsign: Holsten, | D | AVCODES |
| 5159 | HTR | Holstenair Lubeck | | | ICAO1 |
| 5160 | HTRA | H & E AIR CARTAGE | | | SCAC4 |
| 5161 | HTRD | HIGHLAND-TROY READY MIX MATERIAL DIVISION, INC | | | SCAC1 |
| 5162 | HTRF | HANSON TRANSFER, INC | | | SCAC1 |
| 5163 | HTRF | HERMES TRANSPORT | | | SCAC4 |
| 5164 | HTRI | HULL TRUCKING OF MASON CITY INC | | | SCAC4 |
| 5165 | HTRL | HUNTERLINE | | | SCAC4 |
| 5166 | HTRM | HUNTER OIL CO INC | | | SCAC4 |
| 5167 | HTRN | HUNTER TRANSPORTATION COMPANY INCOR | | | SCAC4 |
| 5168 | HTRS | HTRS Süd GmbH | Neuoffingen (HTRS = Husa Transportation Railway Sevices) | D | privat-bahn.de |
| 5169 | HTRS | HALTER TRANSPORTATION SERVICES INC | | | SCAC4 |
| 5170 | HTRSN | HTRNS Nederland bv | | NL | VKM |
| 5171 | HTRT | HERNANDEZ TRUCKING | | | SCAC4 |
| 5172 | HTRU | HARDY TANK LTD | | RUS | BIC |
| 5173 | HTRW | HOLLAND TRUCKING | | | SCAC4 |
| 5174 | HTRX | Houston Terminal Refining Co. | 7/1923-7/1930 | | NAKINA |
| 5175 | HTRX | HOUSTON TERMINAL REFINING CO. | | | PWRC |
| 5176 | HTS | Helitrans Air Service, Inc. | Callsign: Helitrans, | USA | AVCODES |
| 5177 | HTS | Helistar S.A.S. | Callsign: Helisas, | CO | AVCODES |
| 5178 | HTS | Helitrans Air Service | | | ICAO1 |
| 5179 | HTSB | HAVE TRANSPORT SOLUTIONS CORPORATIO | | | SCAC4 |
| 5180 | HTSE | HUNTLEY ENTERPRISES S A | | | SCAC4 |
| 5181 | HTSG | HAITI SHIPPING LINES INC | | | SCAC4 |
| 5182 | HTSH | HIRSCHBACH TRANSPORTATION SERVICES | | | SCAC4 |
| 5183 | HTSJ | HITACHI TRANSPORT SYSTEM LTD | | | SCAC4 |
| 5184 | HTSL | HYNDMAN TRANSPORT (1972) LIMITED | | | SCAC4 |
| 5185 | HTSM | HOT SHOT DELIVERY SERVICE INC | | | SCAC4 |
| 5186 | HTSN | HUNTERS TRUCKING SERVICES INC | | | SCAC4 |
| 5187 | HTSO | HART STUDIOS INC | | | SCAC4 |
| 5188 | HTSP | HUNTER TRANSPORT LTD | | | SCAC4 |
| 5189 | HTSQ | HILLDRUP MOVING & STORAGE | | | SCAC4 |
| 5190 | HTSU | HTS LLC | | RUS | BIC |
| 5191 | HTSU | HIGH TECH TRANSPORT LTD. | | | PWRC |
| 5192 | HTSU | High Tech Transport | | | RSRV |
| 5193 | HTSU | HIGH TECH TRANSPORT, LTD | | | SCAC4 |
| 5194 | HTSV | HORNUNG TRUCKING SERVICE, Manning Distribution Services, INC | | | SCAC1 |
| 5195 | HTSV | HORNUNGS TRUCKING SERVICE | | | SCAC4 |
| 5196 | HTSX | Herzog Transit Services, Inc. | 7/2005 (not listed) | | NAKINA |
| 5197 | HTSX | HERZOG TRANSIT SERVICES, INC. | | | PWRC |
| 5198 | HTSX | Herzog Transit Services | | | RSRV |
| 5199 | HTSX | HERZOG TRANSIT SERVICES INC | | | SCAC4 |
| 5200 | HTT | Air Tchad, Société de Transports Aériens | IATA: HT, Callsign: Hotel Tango, Designator HT recalled by IATA | TCH | AVCODES |
