| 1 | HM | Air Seychelles Limited | ICAO: SEY, Callsign: Seychelles, IATA Prefix: 061, | SY | AVCODES |
| 2 | HM | Humber Airways Ltd. | Callsign: Humber, | GB | AVCODES |
| 3 | HM | Hasselmann GmbH | | DE | VKM |
| 4 | HMA | Air Tahoma, Inc | IATA: 5C, Callsign: Tahoma, Founded in 1995. Ceased operations during 2009. | USA | AVCODES |
| 5 | HMA | Air Tahoma | | | ICAO1 |
| 6 | HMAA | HAL-MARI INC | | | SCAC4 |
| 7 | HMAB | HIGH MOUNTAIN TRANSPORT INC | | | SCAC4 |
| 8 | HMAD | HARDIN DELIVERY INC | | | SCAC4 |
| 9 | HMAE | H M TRUCKING | | | SCAC4 |
| 10 | HMAF | British Armed Forces | Her Majesty's Armed Forces | GB | TRAFFIC |
| 11 | HMAG | HOME AGAIN INC | | | SCAC4 |
| 12 | HMAH | HERBERT, MARCIA | | | SCAC4 |
| 13 | HMAI | HAMORI AUTO INC | | | SCAC4 |
| 14 | HMAL | HARMAC AMERICA INC | | | SCAC4 |
| 15 | HMAM | HER-MAN TRANSFER | | | SCAC4 |
| 16 | HMAN | H. Manhart GmbH | | AT | VKM |
| 17 | HMAO | HUNTSVILLE MARINE AND RECREATION | | | SCAC4 |
| 18 | HMAP | HARDESTY MOVING AND STORAGE CORP | | | SCAC4 |
| 19 | HMAQ | H M TRANSPORT | | | SCAC4 |
| 20 | HMAR | HOMAR ENTERPRISES LIMITED | | | SCAC4 |
| 21 | HMAS | HOMAN, D S | | | SCAC4 |
| 22 | HMAX | Huntsman Petrochemical Corp. | added 4/2003; 7/2005 | | NAKINA |
| 23 | HMAX | Huntsman Corp. | added 4/1996; 7/2000; eliminated 4/2003 | | NAKINA |
| 24 | HMAX | Huntsman Specialty Chemicals Corp. | added 7/1994; eliminated 4/1996 | | NAKINA |
| 25 | HMAX | Huntsman Specialty Chemicals Corp. | added 7/94; eliminated 4/96 | | NRHS |
| 26 | HMAX | Huntsman Corp. | added 4/96; 7/2000 | | NRHS |
| 27 | HMAX | HUNTSMAN SPECIALTY CHEMICALS CORPORATION (HUNTSMAN PETROCHEMICAL) | | | PWRC |
| 28 | HMAX | Huntsman Petrochemical | | | RSRV |
| 29 | HMAX | HUNTSMAN PETROCHEMICAL CORPORATION | | | SCAC4 |
| 30 | HMAY | HASKELL, M A & SONS LLC | | | SCAC4 |
| 31 | HMB | CHC Global Operations | Callsign: Hummingbird, | CDN | AVCODES |
| 32 | HMB | Härtsfeld-Museumsbahn e.V. | Neresheim | D | privat-bahn.de |
| 33 | HMBAU | H&M Bau GmbH | | DE | VKM |
| 34 | HMBC | HAMBONE TRUCKING LLC | | | SCAC4 |
| 35 | HMBD | HAMILTON CONSTRUCTION LLC | | | SCAC4 |
| 36 | HMBE | HAMMONIA REEDERE | | | SCAC4 |
| 37 | HMBI | HOMAN & CO INC | | | SCAC4 |
| 38 | HMBK | H M B TRUCKING | | | SCAC4 |
| 39 | HMBS | HALCOMB, R & J TRANSPORTATION INC | | | SCAC4 |
| 40 | HMBX | HELM Financial Corp. | added 1/2007 | | NAKINA |
| 41 | HMBX | HELM FINANCIAL CORP. | | | PWRC |
| 42 | HMBX | HELM FINANCIAL CORPORATION | | | SCAC4 |
| 43 | HMBY | H & M BAY INC | | | SCAC4 |
| 44 | HMBZ | HELLMANS BREWING CO. | | | PWRC |
| 45 | HMC | Heliamerica de Mexico, S.A. de C.V. | Callsign: Heliamerica, | MEX | AVCODES |
| 46 | HMC | Heliamerica De Mexico | | | ICAO1 |
| 47 | HMCA | HOFFER, PETER CONTEMPORARY ART INC | | | SCAC4 |
| 48 | HMCD | HERMAN FARM | | | SCAC4 |
| 49 | HMCE | HIS MAJESTY COACHES INC | | | SCAC4 |
| 50 | HMCG | H M C TRANSPORTATION INC | | | SCAC4 |
| 51 | HMCH | HEARTLAND MOTOR COACH INC | | | SCAC4 |
| 52 | HMCI | HEWES MARINE CO INC | | | SCAC4 |
| 53 | HMCJ | HAGIE MANUFACTURING CO INC | | | SCAC4 |
| 54 | HMCO | HAIRE MACHINE CORPORATION | | | SCAC4 |
| 55 | HMCP | HENKE MANUFACTURING CORPORATION | | | SCAC4 |
| 56 | HMCQ | H & M CONTAINER TRANSPORT INC | | | SCAC4 |
| 57 | HMCR | The Huntsville and Madison County R.R. Authority | added 7/1985; 1/1994; eliminated 4/1997; 7/2000-7/2005 | | NAKINA |
| 58 | HMCR | The Huntsville and Madison County R.R. Authority | 1/94; eliminated 4/97; 7/2000 | | NRHS |
| 59 | HMCR | HUNTSVILLE & MADISON COUNTY RR AUTHORITY | | | PWRC |
| 60 | HMCR | Huntsville and Madison County Railroad | | | RSRV |
| 61 | HMCT | HAMILL CREEK TIMBERWRIGHTS INC | | | SCAC4 |
| 62 | HMCU | EVERGREEN MARINE (UK) LIMITED | | GB | BIC |
| 63 | HMCU | HATSU MARINE LTD | | | SCAC4 |
| 64 | HMCX | SC Rail Leasing America, Inc. d/b/a Southern Illinois Railcar Co. | added 1/2008 | | NAKINA |
| 65 | HMCX | Southern Illinois Railcar Co. | added 4/2004; 7/2005; eliminated 1/2008 | | NAKINA |
| 66 | HMCX | HoltraChem Manufacturing Co., L.L.C. | added 7/1995; eliminated 7/1997; 7/2000 (not listed) | | NAKINA |
| 67 | HMCX | HoltraChem Manufacturing Co., L.L.C. | added 7/95; eliminated 7/97; 7/2000 | | NRHS |
| 68 | HMCX | *HOLTRACHEM MANUFACTURING CO., LLC | | | PWRC |
| 69 | HMCX | +SC RAIL LEASING AMERICA d/b/a SOUTHERN ILLINOIS RAILCAR CO. | | | PWRC |
| 70 | HMCX | HoltraChem Manufacturing | | | RSRV |
| 71 | HMCX | VTG RAIL INC | | | SCAC4 |
| 72 | HMCY | HOFFMANN MACHINE COMPANY INC | | | SCAC4 |
| 73 | HMD | Charlie Hammonds Flying Service, Inc. | Callsign: Hammond, | USA | AVCODES |
| 74 | HMD | Charlie Hammonds Flying Service | | | ICAO1 |
| 75 | HMDA | HAMEL, DAVID INC | | | SCAC4 |
| 76 | HMDC | HAGAN, M D TRUCKING CO | | | SCAC4 |
| 77 | HMDD | HUNT, J B TRANSPORT INC | | | SCAC4 |
| 78 | HMDE | HOMEDICS INC | | | SCAC4 |
| 79 | HMDK | HAM, D & K TRUCKING LTD | | | SCAC4 |
| 80 | HMDR | H & M DELIVERY SERVICE | | | SCAC4 |
| 81 | HMDT | HMD TRUCKING INC | | | SCAC4 |
| 82 | HMDU | HUBEI HAILI MEIDA AUTOMOBILE CO., LTD. | | PRC | BIC |
| 83 | HME | Hermes Aviation | Callsign: Hergo, | M | AVCODES |
| 84 | HMEA | HAMME | | | SCAC4 |
| 85 | HMEC | HART MOTOR EXPRESS INC | | | PWRC |
| 86 | HMEC | HELADOS MEXICO | | | SCAC4 |
| 87 | HMED | H & M | | | SCAC4 |
| 88 | HMEI | HAMILTON EQUIPMENT INC | | | SCAC4 |
| 89 | HMEL | HAMEL, LEO | | | SCAC4 |
| 90 | HMEM | HAMM | | | SCAC4 |
| 91 | HMER | HOME RUN INC | | | SCAC4 |
| 92 | HMES | HOLLAND MOTOR EXPRESS INC. | | | PWRC |
| 93 | HMES | USF HOLLAND, INC | | | SCAC3 |
| 94 | HMES | HOLLAND MOTOR EXPRESS INC (USF HOLL | | | SCAC4 |
| 95 | HMET | Metropolitan Transit Authority of Harris County | City: Houston | US-TX | TRAFFIC |
| 96 | HMEU | HPCL-MITTAL ENERGY LIMITED | | IND | BIC |
| 97 | HMEV | HAZ-MAT ENVIRONMENTAL SERVICES LLC | | | SCAC4 |
| 98 | HMF | Norrlandsflyg AB | Callsign: Lifeguard Sweden, Name changed to Sjofartsverket. | S | AVCODES |
| 99 | HMF | Sjofartsverket | Callsign: Lifeguard Sweden, Name changed from Norrlandsflyg AB. | S | AVCODES |
| 100 | HMF | Norrlandsflyg | | | ICAO1 |
