| 301 | HANJ | HANJIN EXPRESS | | | SCAC4 |
| 302 | HANKAI | Hankai Tramway Co. | City: Osaka, Sakai | J | TRAFFIC |
| 303 | HANM | HANM TRANSPORTATION MANAGEMENT SERV | | | SCAC4 |
| 304 | HANO | HANDS OF AMERICA INC | | | SCAC4 |
| 305 | HANQ | HANA LOGISTICS | | | SCAC4 |
| 306 | HANR | HANSENS, L FORWARDING LTD | | | SCAC4 |
| 307 | HANS | HANSON TRANSPORT, INC | | | SCAC1 |
| 308 | HANS | HANJIN SHIPPING CO LTD (BULK DIVISI | | | SCAC4 |
| 309 | HANS | Hanseatische Eisenbahn-Gesellschaft | | D | TRAFFIC |
| 310 | HANT | HANAN TRANSPORT | | | SCAC4 |
| 311 | HANU | HCT HANSA CONTAINER TRADING GMBH | | D | BIC |
| 312 | HANU | HANSA LINE | | | PWRC |
| 313 | HANU | Hansa Line | | | RSRV |
| 314 | HANU | HANAN SHIPPING LLC | | | SCAC4 |
| 315 | HANV | HAVEDINGS, ANKO | | | SCAC4 |
| 316 | HANX | L. Hansen's Forwarding | 7/2000-7/2005 (not listed) | | NAKINA |
| 317 | HANX | Hancock Oil Co. of California | 7/1930-4/1947 | | NAKINA |
| 318 | HANX | Hancock Oil Co. of California | Apr-38 | | NRHS |
| 319 | HANX | L. Hansen's Forwarding | Jul-00 | | NRHS |
| 320 | HANX | *HANCOCK OIL CO. OF CALIFORNIA | | | PWRC |
| 321 | HANX | +L. HANSENS FORWARDING | | | PWRC |
| 322 | HANX | L. Hansen's Forwarding | | | RSRV |
| 323 | HANX | HANSENS, L FORWARDING | | | SCAC4 |
| 324 | HANY | HANEY TRUCK LINE | | | SCAC4 |
| 325 | HAO | Holland Aero Leasing B.V. | Callsign: Aerolines, ICAO callsign changed to Tulip. | NL | AVCODES |
| 326 | HAO | Holland Aero Leasing B.V. | IATA: SE, Callsign: Tulip, ICAO callsign changed from Aerolines. | NL | AVCODES |
| 327 | HAO | Harty Aviation | Callsign: Harty, | ET | AVCODES |
| 328 | HAOC | HUNTER-ASH OIL CO INC | | | SCAC4 |
| 329 | HAOI | HARRIS OIL COMPANY INC | | | SCAC4 |
| 330 | HAOS | HAGELAND AVIATION SERVICES INC | | | SCAC4 |
| 331 | HAOT | HARGIN TRANSPORT LLC | | | SCAC4 |
| 332 | HAOY | HAWKINS OIL COMPANY OF LA GRANGE IN | | | SCAC4 |
| 333 | HAP | Helicopteros Aero Personal, S.A. de C.V. | Callsign: Helipersonal, | MEX | AVCODES |
| 334 | HAP | Helicopteros Aero Personal | | | ICAO1 |
| 335 | HAPA | HAPPY AUNTIE S A | | | SCAC4 |
| 336 | HAPC | HILL AND PERRY, INC | | | SCAC4 |
| 337 | HAPE | HAP ENTERPRISES LTD | | | SCAC4 |
| 338 | HAPG | HAMBURG-AMERICAN LINE | | | PWRC |
| 339 | HAPG | HAMBURG AMERICAN LINE | | | SCAC4 |
| 340 | HAPL | HAPPY TRANSPORT LLC | | | SCAC4 |
| 341 | HAPM | HAPPACH MARINE LTD | | | SCAC4 |
| 342 | HAPN | HAMPDEN MOVING & STORAGE INC | | | SCAC4 |
| 343 | HAPP | HAPPY TRUCKING INC | | | SCAC4 |
| 344 | HAPR | HARRIS TRANSPORT COMPANY | | | SCAC1 |
| 345 | HAPR | HARRIS TRANSPORT COMPANY | | | SCAC4 |
| 346 | HAPT | HARMS PACIFIC TRANSPORT INC | | | SCAC4 |
| 347 | HAPU | H.A.P. FOODS HOLLAND B.V. | | NL | BIC |
| 348 | HAPU | H A P FOODS HOLLAND B V | | | SCAC4 |
| 349 | HAPW | HARP, WAYNE TRUCKING INC | | | SCAC4 |
| 350 | HAPX | Helm-Atlantic Leasing Limited Partnership | 7/2000-7/2005 (not listed) | | NAKINA |
| 351 | HAPX | Helm-Atlantic Leasing Limited Partnership | Jul-00 | | NRHS |
| 352 | HAPX | HELM-ATLANTIC LEASING, LP | | | PWRC |
| 353 | HAPX | Helm-Atlantic Leasing | | | RSRV |
| 354 | HAPX | HELM ATLANTIC LEASING LIMITED PARTN | | | SCAC4 |
| 355 | HAQI | HEROIC AQUILA INC | | | SCAC4 |
| 356 | HAQY | HAYNES, JOHN S TRUCKING CO INC | | | SCAC4 |
| 357 | HAR | Harbor Airlines | IATA: HB, Callsign: Harbor, Founded in March 1971, originally named Oak Harbor Airlines. Suspended all flights in May 2001. | USA | AVCODES |
| 358 | HAR | Harbor Airlines | IATA: HB | | ICAO1 |
| 359 | HARC | HARVEST CA | | | SCAC4 |
| 360 | HARD | HARLESS, DICK L | | | SCAC4 |
| 361 | HARE | HARRIS, CHARLES | | | SCAC4 |
| 362 | HARF | HAR-TRANS FREIGHT | | | SCAC4 |
| 363 | HARI | HARRIS, RICHARD L | | | SCAC4 |
| 364 | HARK | HARPER TRUCK LINE INC | | | SCAC4 |
| 365 | HARM | HARMUN TRUCKING INC | | | SCAC4 |
| 366 | HARO | HARMAN TRANSPORTATION | | | SCAC4 |
| 367 | HARP | HARPA | | | SCAC4 |
| 368 | HARR | HARRIER SHIPPING COMPANY LIMITED | | | SCAC4 |
| 369 | HARRIS | Harris Bus | | GB | TRAFFIC |
| 370 | HARS | HARRIS EXPRESS INC | | | PWRC |
| 371 | HART | Huntington Area Rapid Transit | | USA | TRAFFIC |
| 372 | HARTON | Harton Coal Company | | GB | TRAFFIC |
| 373 | HARU | HARBOUR RENTAL & SERVICES BV | | NL | BIC |
| 374 | HARU | CHARENTE STEAMSHIP CO., LTD | | | SCAC3 |
| 375 | HARV | HARVEY TRANSPORT LTD | | | SCAC4 |
| 376 | HARX | General Electric Rail Services Corp. | added 1/2000; 7/2000-7/2005 | | NAKINA |
| 377 | HARX | General Electric Railcar Services Corp. | added 4/1992; 1/1994; eliminated 1/2000 | | NAKINA |
| 378 | HARX | Hargis Railcar, Inc. | added 7/1989; eliminated 4/1992 | | NAKINA |
| 379 | HARX | Harcon Corp. | added 1/1964 | | NAKINA |
| 380 | HARX | Harriman Co. | 7/1930-7/1935 | | NAKINA |
| 381 | HARX | Hargis Railcar, Inc. | added 7/89; eliminated 4/92 | | NRHS |
| 382 | HARX | General Electric Railcar Services Corp. | added 4/92; 1/94; eliminated 1/2000 | | NRHS |
| 383 | HARX | General Electric Rail Services Corp. | added 1/2000; 7/2000 | | NRHS |
| 384 | HARX | *HARRIMAN CO. | | | PWRC |
| 385 | HARX | +(NATX) GENERAL ELECTRIC RAIL SERVICES CORPORATION [HARGIS RAILCAR, INC.] | | | PWRC |
| 386 | HARX | *HAWAII RAILWAY, INC. | | | PWRC |
| 387 | HARX | GE Rail Services Corporation | | | RSRV |
| 388 | HARX | GENERAL ELECTRIC RAILCAR SERVICES C | | | SCAC4 |
| 389 | HARZ | HARRISON RADIATOR | | | PWRC |
| 390 | HAS | Hamburg Airlines, GmbH And Co. | IATA: HX, Callsign: Hamburg Air, Ceased operations | D | AVCODES |
| 391 | HAS | Honduras Airlines | Callsign: Honduras Air, | HN | AVCODES |
| 392 | HAS | Harold's Air Service | Callsign: Harolds, Name changed to Friendship Air Alaska. ICAO desigantor changed to FAL | USA | AVCODES |
| 393 | HAS | Honduras Airlines | | | ICAO1 |
| 394 | HASC | HAULIN A & S | | | SCAC4 |
| 395 | HASD | HAULIN A'S EXPRESS DELIVERY LLC | | | SCAC4 |
| 396 | HASIT | HASIT Šumavské vápenice a omítkárny, a.s. | | CZ | VKM |
| 397 | HASK | HINKLE AND SON TRUCKING | | | SCAC4 |
| 398 | HASL | HILLS AIR SUPPORT LLC | | | SCAC4 |
| 399 | HASN | H AND S CAR CARRIERS INC | | | SCAC4 |
| 400 | HASP | HOLLY ASPHALT COMPANY | | | SCAC4 |
