| 1 | HW | North-Wright Airways Ltd. | ICAO: NWL, Callsign: Northwright, | CDN | AVCODES |
| 2 | HW | Aero Marine Consulting Pty Ltd. d/b/a Transaustralian Air Express Pty. Ltd. | ICAO: AUC, Callsign: Auscargo, IATA designator HW* recalled by IATA | AUS | AVCODES |
| 3 | HW | North-Wright Air Ltd. | ICAO: NWL, Callsign: Northwright, Name changed to North-Wright Airways Ltd. | CDN | AVCODES |
| 4 | HW | Holiday Air | ICAO: HLD, Callsign: Holiday Express, Ceased operations | TR | AVCODES |
| 5 | HW | Guernsey Airlines Ltd. | ICAO: GER, Callsign: Guernsey, IATA designator changed to GE. Wholly-owned subsidary of Alidair | GB | AVCODES |
| 6 | HW | Hello AG | ICAO: FHE, Callsign: Fly Hello, IATA Prefix: 590, Ceased operations on 16 October 2012 | CH | AVCODES |
| 7 | HW | Hastrabau-Wegener GmbH & Co. KG | | DE | VKM |
| 8 | HWA | Hillwood Airways LLC | Callsign: Hillwood, Name changed from ATX Air Services | USA | AVCODES |
| 9 | HWAD | HERWYNEN SAW MILL LTD | | | SCAC4 |
| 10 | HWAP | HOWELL TRUCKING | | | SCAC4 |
| 11 | HWAR | HOWARD PETROLEUM CO | | | SCAC4 |
| 12 | HWAS | HAWKEYE NORTH AMERICAN | | | SCAC4 |
| 13 | HWAW | HAWLEY, AL TRUCKING INC | | | SCAC4 |
| 14 | HWAY | HAMBURG FIREWORKS DISPLAY INC | | | SCAC4 |
| 15 | HWB | Hochwaldbahn e.V. | Hermeskeil (auch: Hochwaldbahn GmbH) | D | privat-bahn.de |
| 16 | HWB | Huttwil-Wolhusen-Bahn | | CH | TRAFFIC |
| 17 | HWB | HWB Hochwaldbahn Servicegesellschaft mbH | | DE | VKM |
| 18 | HWBG | Hochwaldbahn: HWB Verkehrsgesellschaft mbH | Real: HWB | D | TRAFFIC |
| 19 | HWBI | HOWARD, BILL CO INC | | | SCAC4 |
| 20 | HWBJ | HARTWELL, B JOE TRUCKING | | | SCAC4 |
| 21 | HWBK | H W B TRUCKING | | | SCAC4 |
| 22 | HWBM | HOWELL, BILL TRUCKING INC (MAXI DIV | | | SCAC4 |
| 23 | HWBR | HIGHWAYS & SKYWAYS INC | | | SCAC4 |
| 24 | HWBU | HANS W BARBE CHEMISCHE ERZEUGNISSE | | | SCAC4 |
| 25 | HWBV | HOWELL, BILL TRUCKING INC (VAN DIVI | | | SCAC4 |
| 26 | HWBV | Hochwaldbahn e.V. | Real: HWB | D | TRAFFIC |
| 27 | HWBV | HWB Verkehrsgesellschaft mbH | | DE | VKM |
| 28 | HWBZ | Hochwaldbahn | Real: HWB, City: Zittau | D | TRAFFIC |
| 29 | HWCA | HWC TRANSPORTATION LLC | | | SCAC4 |
| 30 | HWCC | HOWL TRANSPORTATION LLC | | | SCAC4 |
| 31 | HWCG | HAWAII CARGO SERVICES INC | | | SCAC4 |
| 32 | HWCI | HANDLE WITH CARE INC | | | SCAC4 |
| 33 | HWCN | H & W CONTRACT CARRIERS INC | | | SCAC4 |
| 34 | HWCQ | HODGES WAREHOUSE, Port City Properties, INC | | | SCAC1 |
| 35 | HWCQ | HODGES WAREHOUSE | | | SCAC4 |
| 36 | HWCR | HALLIBURTON CO | | | PWRC |
| 37 | HWCR | HOLLOWAY COURIER SERVICES LTD | | | SCAC4 |
| 38 | HWCT | HIWAY COURIER AND TRUCKING | | | SCAC4 |
| 39 | HWCX | Halliburton Energy Services, Inc. | added 4/2004; 7/2005 | | NAKINA |
| 40 | HWCX | Halliburton Co. | added 10/1960; 4/1961-7/2000; eliminated 4/2004 | | NAKINA |
| 41 | HWCX | Halliburton Oil Well Cementing Co. | 1/1946-10/1957; eliminated 10/1960 | | NAKINA |
| 42 | HWCX | Halliburton Co. | added 10/60; 4/61-7/2000 | | NRHS |
| 43 | HWCX | Halliburton Oil Well Cementing Co. | 1/52-10/57; eliminated 10/60 | | NRHS |
| 44 | HWCX | HALLIBURTON ENERGY SERVICES CO. {HALLIBURTON OIL WELL CEMENTING CO.] | | | PWRC |
| 45 | HWCX | Halliburton | | | RSRV |
| 46 | HWCX | HALLIBURTON ENERGY SERVICES INC | | | SCAC4 |
| 47 | HWCX | Halliburton Co. | | USA | TRAFFIC |
| 48 | HWCY | HANDLE WITH CARE MOVING SYSTEMS LTD | | | SCAC4 |
| 49 | HWD | Sunseeker Sales (UK) Limited | Callsign: Sunseeker, Name changed to HPM Investments Ltd. ICAO callsign changed to Flitewise | GB | AVCODES |
| 50 | HWD | HPM Investments Ltd. | Callsign: Flitewise, Name changed from Sunseeker Sales (UK) Limited. ICAO callsign changed from Sunseeker | GB | AVCODES |
| 51 | HWD | HPM Investments | | | ICAO1 |
| 52 | HWDA | HOG WILD TRANSPORTATION INC | | | SCAC4 |
| 53 | HWDG | HOWARD LOGISTIC INC | | | SCAC4 |
| 54 | HWDI | HOWLIN HILL TRANS | | | SCAC4 |
| 55 | HWDO | H & W DELIVERY | | | SCAC4 |
| 56 | HWDQ | HOLLYWOOD DELIVERY SERVICE, INC | | | SCAC1 |
| 57 | HWDQ | HOLLYWOOD DELIVERY SERVICE INC | | | SCAC4 |
| 58 | HWDS | H W DELIVERY SYSTEMS CORP | | | SCAC4 |
| 59 | HWDT | HOWARD TRUCKING | | | SCAC4 |
| 60 | HWEA | HWE AGRICULTURAL TECHNOLOGY LTD | | | SCAC4 |
| 61 | HWEB | HARTWELL, BERT | | | SCAC4 |
| 62 | HWEL | HOPEWELL TRUCKING | | | SCAC4 |
| 63 | HWEP | HOWARDS EXPRESS (DIV OF RIST TRANSP | | | SCAC4 |
| 64 | HWEQ | H & W EQUIPMENT FOR VINEYARD & | | | SCAC4 |
| 65 | HWES | HOPEWELL ENTERPRISES | | | SCAC4 |
| 66 | HWFI | HOWELL FUEL INC | | | SCAC4 |
| 67 | HWFL | HIGHWAY FUEL | | | SCAC4 |
| 68 | HWFM | HOLOWATY FARMS LTD | | | SCAC4 |
| 69 | HWFN | HIGHWAY 15 RECYCLING AND AUTO SALVA | | | SCAC4 |
| 70 | HWG | Hawei Air GmbH | | A | AVCODES |
| 71 | HWGN | HOWGEN TRANSPORT CO INC | | | SCAC4 |
| 72 | HWGO | HOWARD GASOLINE & OIL CO | | | SCAC4 |
| 73 | HWH | Helicopter World | Callsign: Heliworld, | E | AVCODES |
| 74 | HWHS | HONIGS WHISTLE STOP | | | SCAC4 |
| 75 | HWHT | HOFER TRUCKING | | | SCAC1 |
| 76 | HWHU | HELLEMAN WAREHOUSING | | NL | BIC |
| 77 | HWHU | HELLEMAN WAREHOUSING | | | SCAC4 |
| 78 | HWIA | HOSPIRA WORLDWIDE INC | | | SCAC4 |
| 79 | HWIC | HIPPO WORKS INC | | | SCAC4 |
| 80 | HWIF | HAWAII TRANSFER CO LTD | | | SCAC4 |
| 81 | HWIU | HEALDWORKS INC | | USA | BIC |
| 82 | HWIU | Healdworks | | | RSRV |
| 83 | HWJN | HOWLAND, JOHN | | | SCAC4 |
| 84 | HWJR | HEWITT, J R INC | | | SCAC4 |
| 85 | HWK | Swazi Air Charter (Pty) Ltd. | Callsign: Hawk, Ceased operations. | SD | AVCODES |
| 86 | HWK | Hawkrise Air Services Ltd. | Callsign: Hawkrise, | GB | AVCODES |
| 87 | HWK | Brainerd Helicopters, Inc. t/a Firehawk Helicopters | Callsign: Firehawk, | USA | AVCODES |
| 88 | HWKA | HAWKINS CHARTER SERVICE INC | | | SCAC4 |
| 89 | HWKB | HAWTHORNE TRUCKING LLC | | | SCAC4 |
| 90 | HWKC | HANDWERK CONTRACTORS | | | SCAC4 |
| 91 | HWKH | HARTWICK & HAND INC | | | SCAC4 |
| 92 | HWKI | HAWKINS TRUCKING L C | | | SCAC4 |
| 93 | HWKK | HAWK-N-TRANS TRUCKING LLC | | | SCAC4 |
| 94 | HWKN | HAWKS, LOREN | | | SCAC4 |
| 95 | HWKO | HAWKES, WILLIAM PRODUCTS | | | SCAC4 |
| 96 | HWKP | HAWKS TRANSPORT | | | SCAC4 |
| 97 | HWKQ | HOLLYWOOD TRUCKING SOLUTIONS INC | | | SCAC4 |
| 98 | HWKT | HAWK, RANDY TRUCKING INC | | | SCAC4 |
| 99 | HWKW | HAWKWAY INDUSTRIES INC | | | SCAC4 |
| 100 | HWLB | H & W LOGISTICS INC | | | SCAC4 |
