| 1 | HC | Naske-Air | ICAO: HCN, Callsign: Naske Air, | D | AVCODES |
| 2 | HC | Aero-Tropics Air Services d/b/a Lip Air Ltd. | ICAO: ATI, Name changed to Lip-Air Pty. Ltd. d/b/a Aero-Tropics Air Services. Name changed from Lip-Air d/b/a Aero Tropics | AUS | AVCODES |
| 3 | HC | Lip-Air d/b/a Aero Tropics | ICAO: ATI, Name changed to Aero-Tropics Air Services d/b/a Lip Air Ltd. | AUS | AVCODES |
| 4 | HC | Lip-Air Pty. Ltd. d/b/a Aero-Tropics Air Services | ICAO: ATI, Name changed from Aero-Tropics Air Services d/b/a Lip Air Ltd. Name previously changed from Lip-Air d/b/a Aero Tropics | AUS | AVCODES |
| 5 | HC | Aviaction, Hanseatische Luftreederei | Callsign: Aviaction, | D | AVCODES |
| 6 | HC | Société Air Esterel | | F | AVCODES |
| 7 | HC | Cargoman Limited | ICAO: CGM, Callsign: Hotel Charlie, Ceased operations. Designator HC recalled by IATA | OM | AVCODES |
| 8 | HC | HeavyLift International Airlines d/b/a Heavy Lift | ICAO: HVL, Callsign: Heavylift International, IATA Prefix: 310, | UAE | AVCODES |
| 9 | HC | Avient Cameroon S.A. | Callsign: Sanaga, IATA Prefix: 377, | CAM | AVCODES |
| 10 | HC | Holidays Czech Airlines | ICAO: HCC, Callsign: Czech Holidays, Designator HC recalled by IATA | CZ | AVCODES |
| 11 | HC | Air Senegal S.A. | ICAO: SZN, Callsign: Sensa, | SN | AVCODES |
| 12 | HC | Hannibal Connecting R.R. | 1/1946-7/1965 | | NAKINA |
| 13 | HC | Hannibal Connecting | 1/52-7/65 | | NRHS |
| 14 | HC | Arbeitskreis Historischer Zug Hessencourier e.V. | Kassel | D | privat-bahn.de |
| 15 | HC | HANNIBAL CONNECTING RAILROAD | | | PWRC |
| 16 | HC | Hessencourier e.V | | DE | VKM |
| 17 | HCA | Lake Havasu Air Service | Callsign: Havasu, | USA | AVCODES |
| 18 | HCA | Lake Havasu Air Service | | | ICAO1 |
| 19 | HCAA | HAROLD TRUCKING INC | | | SCAC4 |
| 20 | HCAC | HERNDON, C HAYNE & CO INC | | | SCAC4 |
| 21 | HCAE | HERNANDEZ CANTU, AARON BARTOLO | | | SCAC4 |
| 22 | HCAH | HOLT CAT | | | SCAC4 |
| 23 | HCAI | HEDRICK, DAVID K TRUCKING | | | SCAC4 |
| 24 | HCAX | HENNEPIN COUNTY REGIONAL RAIL | | | PWRC |
| 25 | HCB | Helenair (Barbados) | Callsign: Helen, | BDS | AVCODES |
| 26 | HCB | Helenair (Barbados) | | | ICAO1 |
| 27 | HCBC | Hokkaido Chuo Bus Co., Ltd. | | J | TRAFFIC |
| 28 | HCBP | HCB TRANSPORT | | | SCAC4 |
| 29 | HCBT | HIGH CUBE TRANSPORTATION LTD | | | SCAC4 |
| 30 | HCBU | CULINA GROUP | | GB | BIC |
| 31 | HCBX | Chevron Phillips Chemical Co., LP | added 4/2002; 7/2005 | | NAKINA |
| 32 | HCBX | CHEVRON PHILLIPS CHEMICAL CO. LP | | | PWRC |
| 33 | HCBX | Chevron Phillips Chemical | | | RSRV |
| 34 | HCBX | CHEVRON PHILLIPS CHEMICAL COMPANY L | | | SCAC4 |
| 35 | HCC | Helbey Air Cargo | Callsign: Helbey, | ZW | AVCODES |
| 36 | HCC | Holidays Czech Airlines | IATA: HC, Callsign: Czech Holidays, Designator HC recalled by IATA | CZ | AVCODES |
| 37 | HCC | Heli and Co S.A. | Callsign: Helianco, | B | AVCODES |
| 38 | HCCC | HEROIC CAPRICORNUS INC | | | SCAC4 |
| 39 | HCCE | HIRSCH, CHARLES C TRUCKING | | | SCAC4 |
| 40 | HCCG | HC - CHARTERING GMBH | | | SCAC4 |
| 41 | HCCM | HARMONY COUNTRY COOPERATIVE | | | SCAC4 |
| 42 | HCCS | HANCOCK CARRIERS INC | | | SCAC4 |
| 43 | HCCT | HELENA CHEMICAL CO | | | SCAC4 |
| 44 | HCCU | HCCR HAMBURGER CONTAINER & CHASSIS REPARATUR GmbH | | D | BIC |
| 45 | HCCU | HCCR HAMBURGER CONTAINER UND CHASSI | | | SCAC4 |
| 46 | HCCV | HCC SERVICE COMPANY | | | SCAC4 |
| 47 | HCCX | Southeastern Industrial Enterprises, Inc. | added 10/2002; 7/2005 | | NAKINA |
| 48 | HCCX | Hercules Cement Co. | added 4/1981 | | NAKINA |
| 49 | HCCX | Hercules Cement Co., An AMCORD Co. | added 1/1978; 1/1980; eliminated 4/1981 | | NAKINA |
| 50 | HCCX | Hercules Cement Co., a Division of American Cement Corp. | added 4/1973; 1/1975; eliminated 1/1978 | | NAKINA |
| 51 | HCCX | Hercules Division—American Cement Corp. | added 7/1966; 10/1966-4/1970; eliminated 4/1973 | | NAKINA |
| 52 | HCCX | Hercules Cement Co. | added 10/1963; 7/1965; eliminated 7/1966 | | NAKINA |
| 53 | HCCX | Hercules Cement Corp. | 7/1935-7/1954; eliminated 10/1957 | | NAKINA |
| 54 | HCCX | Hercules Cement Corp. | 4/38-1/52; eliminated 10/57 | | NRHS |
| 55 | HCCX | Hercules Cement Co. | 7/65; eliminated 7/66 | | NRHS |
| 56 | HCCX | Hercules Division--American Cement Corp. | added 7/66; 10/66-4/70; eliminated 4/73 | | NRHS |
| 57 | HCCX | Hercules Cement Co., a Division of American Cement Corp. | added 4/73; 1/75; eliminated 1/78 | | NRHS |
| 58 | HCCX | Hercules Cement Co., An AMCORD Co. | added 1/78; 1/80; eliminated 4/81 | | NRHS |
| 59 | HCCX | Hercules Cement Co. | added 4/81 | | NRHS |
| 60 | HCCX | *HERCULES CEMENT COMPANY | | | PWRC |
| 61 | HCCX | +SOUTHEASTERN INDUSTRIAL ENTERPRISES, INC. | | | PWRC |
| 62 | HCCX | Hercules Cement | | | RSRV |
| 63 | HCCX | SOUTHEASTERN INDUSTRIAL ENTERPRISES | | | SCAC4 |
| 64 | HCCZ | HARRISON CEMENT COMPANY | | | PWRC |
| 65 | HCDD | HUNT, J B TRANSPORT INC | | | SCAC4 |
| 66 | HCDI | HERNANDEZ CAMARENA, DAVID ENRIQUE | | | SCAC4 |
| 67 | HCDK | HICKORY DICKORY DECKS | | | SCAC4 |
| 68 | HCDL | HIGEAR CDL | | | SCAC4 |
| 69 | HCDU | CONTAINERDIENST HAEMMERLE GMBH | | A | BIC |
| 70 | HCDU | ER NAHRUNGSMITTEL GMBH & COMPANY KG. | | | PWRC |
| 71 | HCDU | ER Nahrungsmittel GmBH and KG | | | RSRV |
| 72 | HCDU | CONTAINERDIENST HANS HAEMMERLE | | | SCAC3 |
| 73 | HCDU | CONTAINERDIENST HANS HAEMMERLE GMBH | | | SCAC4 |
| 74 | HCDY | HOSS CARTAGE & DISTRIBUTION | | | SCAC4 |
| 75 | HCEA | HIGH CARGO EXPRESSS LLC | | | SCAC4 |
| 76 | HCEC | HARBOR CHOICE EXPRESS LTD CORP | | | SCAC4 |
| 77 | HCEK | HIGHWAY CARRIER EXPRESS LLC | | | SCAC4 |
| 78 | HCEL | HIGH COUNTRY EXPRESS LLC | | | SCAC4 |
| 79 | HCEP | HIGHBOOST CORP | | | SCAC4 |
| 80 | HCEZ | HAWLEY CI-OP ELEVATOR | | | PWRC |
| 81 | HCF | Helicopterflights Ltd. | Callsign: Eagle, | M | AVCODES |
| 82 | HCFD | HOMEWOOD COL FARMS LTD | | | SCAC4 |
| 83 | HCFK | HORSESHOE CREEK FARMS LTD | | | SCAC4 |
| 84 | HCFM | HILLSBOROUGH COUNTY FLEET MANAGEMEN | | | SCAC4 |
| 85 | HCFN | HAT CREEK FARM INC | | | SCAC4 |
| 86 | HCFR | HILLSIDE CONTEMPORARY FURNISHINGS | | | SCAC4 |
| 87 | HCFT | HIGH COUNTRY FREIGHT LLC | | | SCAC4 |
| 88 | HCFX | H.C. Frick Coke Co. | 8/1920-7/1923 | | NAKINA |
| 89 | HCFX | H. C. FRICK COKE CO. | | | PWRC |
| 90 | HCG | Helicopteros de Guatemala | | GCA | AVCODES |
| 91 | HCGO | HULL COOPERATIVE ASSOCIATION | | | SCAC4 |
| 92 | HCGR | HAMMOND CARGO SERVICES, INC | | | SCAC1 |
| 93 | HCGU | HOUSTON CONTAINER CONNECTION | | USA | BIC |
| 94 | HCGU | Houston Container Connection | | | RSRV |
| 95 | HCGX | North American Salt Co. | added 1/1995; 7/2000-7/2005 | | NAKINA |
| 96 | HCGX | North American Salt Co. | added 1/95; 7/2000 | | NRHS |
| 97 | HCGX | NORTH AMERICAN SALT COMPANY | | | PWRC |
| 98 | HCGX | North American Salt | | | RSRV |
| 99 | HCGX | NORTH AMERICAN SALT | | | SCAC4 |
| 100 | HCH | Hellis Avia Charter | Callsign: Hellisavia, | MD | AVCODES |
