| 701 | HBT | Polizeihubschrauberstaffel Thuringen | | | ICAO1 |
| 702 | HBT | Houston Belt & Terminal Ry. Co. | 1/1975-1/1994; eliminated 1/1998; added 10/1999; 7/2000-7/2005 | | NAKINA |
| 703 | HBT | Houston Belt & Terminal Ry. Co. | 1/75-1/94; eliminated 1/98; added 10/99; 7/2000 | | NRHS |
| 704 | HBT | HOUSTON BELT & TERMINAL RAILWAY | | | PWRC |
| 705 | HBT | Houston Belt and Terminal Railway | | | RSRV |
| 706 | HBT | HOUSTON BELT & TERMINAL RAILWAY COM | | | SCAC4 |
| 707 | HBT | Houston Belt and Terminal Railway | | USA | TRAFFIC |
| 708 | HBTB | HORSESHOE BAY TRANSLOAD INC | | | SCAC4 |
| 709 | HBTC | HORAB TRANSPORT COMPANY | | | SCAC4 |
| 710 | HBTF | HUNTERS BAY TRUCKING LLC | | | SCAC4 |
| 711 | HBTH | HOYT BROTHERS TRUCKING INC | | | SCAC4 |
| 712 | HBTK | H & B TRUCKING LLC | | | SCAC4 |
| 713 | HBTM | HAWKS BLUFF TRUCKING INC | | | SCAC4 |
| 714 | HBTN | HORNADY TRANSPORTATION LLC | | | SCAC4 |
| 715 | HBTO | HILL BROTHERS TRANSPORTATION INC (D | | | SCAC4 |
| 716 | HBTU | HANBAO CONTAIINER SHIPPING & TRADING GMBH | | D | BIC |
| 717 | HBTU | HANBAO CONTAINER SHIPPING & TRADING | | | SCAC4 |
| 718 | HBTV | HILL BROS TRANSPORTATION INC (TEMPE | | | SCAC4 |
| 719 | HBTW | HASTINGS, BEN TRUCKING | | | SCAC4 |
| 720 | HBTY | HANNA BROTHERS TRANSPORT INC | | | SCAC4 |
| 721 | HBU | Universal Avia | Callsign: Kharkiv Universal, Ceased operations. | UA | AVCODES |
| 722 | HBU | Universal Avia | | | ICAO1 |
| 723 | HBUG | HB TRUCKING | | | SCAC4 |
| 724 | HBV | MISSOURI PACIFIC [HOUSTON & BRAZOS VALLEY RY] | | | PWRC |
| 725 | HBVS | HARBOUR VIEW VARIETY | | | SCAC4 |
| 726 | HBWI | HUDSON BOAT WORKS INC | | | SCAC4 |
| 727 | HBWK | HUTCHINSONS BOAT WORKS INC | | | SCAC4 |
| 728 | HBWM | HARBOUR WEST MARINE TRANSPORT | | | SCAC4 |
| 729 | HBWU | HAL CHEMICALS FZE | | UAE | BIC |
| 730 | HBWU | WEW WESTERWAELDER EISENWERK GMBH | | | SCAC4 |
| 731 | HBWX | Georgia Power Co. | added 1/1997; 7/2000-7/2005 | | NAKINA |
| 732 | HBWX | Georgia Power Co. | added 1/97; 7/2000 | | NRHS |
| 733 | HBWX | GEORGIA POWER COMPANY | | | PWRC |
| 734 | HBWX | Georgia Power | | | RSRV |
| 735 | HBX | Hately Bros. Co. | 8/1920-7/1954; eliminated 4/1957 | | NAKINA |
| 736 | HBX | Hately Bros. Co. | 4/38-1/52; eliminated 4/57 | | NRHS |
| 737 | HBX | *HATELY BROS. CO. | | | PWRC |
| 738 | HBX | *HOBO RAILROAD EXPRESS | | | PWRC |
| 739 | HBXC | HRIBAR TRANSPORT LLC | | | SCAC4 |
| 740 | HBXL | HILL BROS EXPRESSWAYS LTD | | | SCAC4 |
| 741 | HBXP | HUGGY BEAR EXPRESS INC | | | SCAC4 |
| 742 | HBXS | H B XPRESS INC | | | SCAC4 |
| 743 | HBXT | HUMBLE TRANSPORT LLC | | | SCAC4 |
| 744 | HBYB | HAMBY, BRUCE TRUCKING INC | | | SCAC4 |
| 745 | HC | Naske-Air | ICAO: HCN, Callsign: Naske Air, | D | AVCODES |
| 746 | 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 |
| 747 | 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 |
| 748 | 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 |
| 749 | HC | Aviaction, Hanseatische Luftreederei | Callsign: Aviaction, | D | AVCODES |
| 750 | HC | Société Air Esterel | | F | AVCODES |
| 751 | HC | Cargoman Limited | ICAO: CGM, Callsign: Hotel Charlie, Ceased operations. Designator HC recalled by IATA | OM | AVCODES |
| 752 | HC | HeavyLift International Airlines d/b/a Heavy Lift | ICAO: HVL, Callsign: Heavylift International, IATA Prefix: 310, | UAE | AVCODES |
| 753 | HC | Avient Cameroon S.A. | Callsign: Sanaga, IATA Prefix: 377, | CAM | AVCODES |
| 754 | HC | Holidays Czech Airlines | ICAO: HCC, Callsign: Czech Holidays, Designator HC recalled by IATA | CZ | AVCODES |
| 755 | HC | Air Senegal S.A. | ICAO: SZN, Callsign: Sensa, | SN | AVCODES |
| 756 | HC | Hannibal Connecting R.R. | 1/1946-7/1965 | | NAKINA |
| 757 | HC | Hannibal Connecting | 1/52-7/65 | | NRHS |
| 758 | HC | Arbeitskreis Historischer Zug Hessencourier e.V. | Kassel | D | privat-bahn.de |
| 759 | HC | HANNIBAL CONNECTING RAILROAD | | | PWRC |
| 760 | HC | Hessencourier e.V | | DE | VKM |
| 761 | HCA | Lake Havasu Air Service | Callsign: Havasu, | USA | AVCODES |
| 762 | HCA | Lake Havasu Air Service | | | ICAO1 |
| 763 | HCAA | HAROLD TRUCKING INC | | | SCAC4 |
| 764 | HCAC | HERNDON, C HAYNE & CO INC | | | SCAC4 |
| 765 | HCAE | HERNANDEZ CANTU, AARON BARTOLO | | | SCAC4 |
| 766 | HCAH | HOLT CAT | | | SCAC4 |
| 767 | HCAI | HEDRICK, DAVID K TRUCKING | | | SCAC4 |
| 768 | HCAX | HENNEPIN COUNTY REGIONAL RAIL | | | PWRC |
| 769 | HCB | Helenair (Barbados) | Callsign: Helen, | BDS | AVCODES |
| 770 | HCB | Helenair (Barbados) | | | ICAO1 |
| 771 | HCBC | Hokkaido Chuo Bus Co., Ltd. | | J | TRAFFIC |
| 772 | HCBP | HCB TRANSPORT | | | SCAC4 |
| 773 | HCBT | HIGH CUBE TRANSPORTATION LTD | | | SCAC4 |
| 774 | HCBU | CULINA GROUP | | GB | BIC |
| 775 | HCBX | Chevron Phillips Chemical Co., LP | added 4/2002; 7/2005 | | NAKINA |
| 776 | HCBX | CHEVRON PHILLIPS CHEMICAL CO. LP | | | PWRC |
| 777 | HCBX | Chevron Phillips Chemical | | | RSRV |
| 778 | HCBX | CHEVRON PHILLIPS CHEMICAL COMPANY L | | | SCAC4 |
| 779 | HCC | Helbey Air Cargo | Callsign: Helbey, | ZW | AVCODES |
| 780 | HCC | Holidays Czech Airlines | IATA: HC, Callsign: Czech Holidays, Designator HC recalled by IATA | CZ | AVCODES |
| 781 | HCC | Heli and Co S.A. | Callsign: Helianco, | B | AVCODES |
| 782 | HCCC | HEROIC CAPRICORNUS INC | | | SCAC4 |
| 783 | HCCE | HIRSCH, CHARLES C TRUCKING | | | SCAC4 |
| 784 | HCCG | HC - CHARTERING GMBH | | | SCAC4 |
| 785 | HCCM | HARMONY COUNTRY COOPERATIVE | | | SCAC4 |
| 786 | HCCS | HANCOCK CARRIERS INC | | | SCAC4 |
| 787 | HCCT | HELENA CHEMICAL CO | | | SCAC4 |
| 788 | HCCU | HCCR HAMBURGER CONTAINER & CHASSIS REPARATUR GmbH | | D | BIC |
| 789 | HCCU | HCCR HAMBURGER CONTAINER UND CHASSI | | | SCAC4 |
| 790 | HCCV | HCC SERVICE COMPANY | | | SCAC4 |
| 791 | HCCX | Southeastern Industrial Enterprises, Inc. | added 10/2002; 7/2005 | | NAKINA |
| 792 | HCCX | Hercules Cement Co. | added 4/1981 | | NAKINA |
| 793 | HCCX | Hercules Cement Co., An AMCORD Co. | added 1/1978; 1/1980; eliminated 4/1981 | | NAKINA |
| 794 | HCCX | Hercules Cement Co., a Division of American Cement Corp. | added 4/1973; 1/1975; eliminated 1/1978 | | NAKINA |
| 795 | HCCX | Hercules Division—American Cement Corp. | added 7/1966; 10/1966-4/1970; eliminated 4/1973 | | NAKINA |
| 796 | HCCX | Hercules Cement Co. | added 10/1963; 7/1965; eliminated 7/1966 | | NAKINA |
| 797 | HCCX | Hercules Cement Corp. | 7/1935-7/1954; eliminated 10/1957 | | NAKINA |
| 798 | HCCX | Hercules Cement Corp. | 4/38-1/52; eliminated 10/57 | | NRHS |
| 799 | HCCX | Hercules Cement Co. | 7/65; eliminated 7/66 | | NRHS |
| 800 | HCCX | Hercules Division--American Cement Corp. | added 7/66; 10/66-4/70; eliminated 4/73 | | NRHS |
