| 1 | HZ | HR | TRAFFIC | ||
| 2 | HZ | Hrvatske Željeznice | HR | VKM | |
| 3 | HZA | Horizon Airlines | IATA: BN | ICAO1 | |
| 4 | HZAI | HZT INTERNATIONAL INC | SCAC4 | ||
| 5 | HZAR | HUZAR LOGISITCS INC | SCAC4 | ||
| 6 | HZBN | HERNANDEZ, BENJAMIN | SCAC4 | ||
| 7 | HZCAR | HŽ CARGO d.o.o. | HR | VKM | |
| 8 | HZCH | HERNANDEZ ORTIZ, JOSE ALFREDO | SCAC4 | ||
| 9 | HZCI | HERNANDEZ RUIZ, ARTURO | SCAC4 | ||
| 10 | HZEC | HORIZON ENTERTAINMENT CARGO CO | SCAC4 | ||
| 11 | HZEG | HAZMAT ENVIRONMENTAL GROUP INC | SCAC4 | ||
| 12 | HZEL | HAZEL TRUCKING CORPORATION | SCAC4 | ||
| 13 | HZEN | HAZEN TRANSPORT INC | SCAC4 | ||
| 14 | HZEP | HINZ ENTERPRISES LLC | SCAC4 | ||
| 15 | HZER | HAZER ENTERPRISES INC | SCAC4 | ||
| 16 | HZGT | HERZOG TRUCKING INC | SCAC4 | ||
| 17 | HZGV | HERNANDEZ GARCIA, VIOLETA | SCAC4 | ||
| 18 | HZGX | Herzog Contracting Corp. | added 7/1991; 1/1994-7/2005 | NAKINA | |
| 19 | HZGX | Herzog Contracting Corp. | added 7/91; 1/94-7/2000 | NRHS | |
| 20 | HZGX | HERZOG CONTRACTING CORPORATION | PWRC | ||
| 21 | HZGX | Herzog Contracting Corporation | RSRV | ||
| 22 | HZGX | HERZOG RAILROAD SERVICES INC | SCAC4 | ||
| 23 | HZHS | HAZELS HOTSHOT SERVICE | SCAC4 | ||
| 24 | HZJE | HERNANDEZ, JUAN E INC | SCAC4 | ||
| 25 | HZKL | HOUTZ TRUCKING LLC | SCAC4 | ||
| 26 | HZL | Hazelton Airlines | ICAO1 | ||
| 27 | HzL | Hohenzollerische Landesbahn AG | Hechingen | D | privat-bahn.de |
| 28 | HZL | Hohenzollerische Landesbahn AG | D | TRAFFIC | |
| 29 | HZL | Hohenzollerische Landesbahn | DE | VKM | |
| 30 | HZLA | Hazelton Airlines | AUS | TRAFFIC | |
| 31 | HZLC | HORIZON LOGISTICS LLC | SCAC4 | ||
| 32 | HZLG | HAZMAT LOGISTICS INC | SCAC4 | ||
| 33 | HZLS | HORIZON LIMOUSINE SERVICE | SCAC4 | ||
| 34 | HZMA | HORIZON MOTOR COACH INC | SCAC4 | ||
| 35 | HZMC | HORIZON MARINE CORPORATION | SCAC4 | ||
| 36 | HZMG | HORIZON MOVING & STORAGE | SCAC4 | ||
| 37 | HZNA | HORIZON AIR SERVICES INC | SCAC4 | ||
| 38 | HZND | HORIZON DISTRIBUTION INC | SCAC4 | ||
| 39 | HZNF | HORIZON FREIGHT SYSTEM INC | SCAC4 | ||
| 40 | HZNL | HOLTZMAN PROPANE LLC | SCAC4 | ||
| 41 | HZNS | HORIZONA SHIPPING CO LTD MALTA | SCAC4 | ||
| 42 | HZNT | HINZ TRUCKING INC | SCAC4 | ||
| 43 | HZNV | HORIZON VAN LINES INC | SCAC4 | ||
| 44 | HZOP | HUAZO TRANSPORT | SCAC4 | ||
| 45 | HZPP | HŽ Putnički prijevoz | HR | TRAFFIC | |
| 46 | HZPP | HŽ PUTNIČKI PRIJEVOZ d.o.o. | HR | VKM | |
| 47 | HZPR | HAZPRO TRANSPORTATION LLC | SCAC4 | ||
| 48 | HZRA | HERNANDEZ RODRIGUEZ, ALBERTO | SCAC4 | ||
| 49 | HZRD | HERTZ, ROGER TRUCKING INC | SCAC4 | ||
| 50 | HZRK | HERNANDEZ, R TRUCKING | SCAC4 | ||
| 51 | HZT | Air Horizon | IATA: 8C | ICAO1 | |
| 52 | HZTG | HORIZON TRANSPORTATION SERVICES/HTS | SCAC4 | ||
| 53 | HZTI | HORIZON TRANSPORT INC | SCAC4 | ||
| 54 | HZTN | HORIZON TESTING INC | SCAC4 | ||
| 55 | HZTO | HORZEN, T REFRIGERATED TRANSPORT IN | SCAC4 | ||
| 56 | HZTP | HORIZON TRANSPORTATION INC | SCAC4 | ||
| 57 | HZTS | HORIZON TRANSPORTATION SERVICES INC | SCAC4 | ||
| 58 | HZUS | HARTWELL DZUS SA DE CV | SCAC4 | ||
| 59 | HZVV | HŽ VUČA VLAKOVA | HR | VKM | |
| 60 | HZX | Citic General Aviation | ICAO1 | ||
| 61 | HZX | The Hegeler Zinc Co. | 8/1920-7/1954; eliminated 1/1955 | NAKINA | |
| 62 | HZX | The Hegeler Zinc Co. | 4/38-1/52 | NRHS | |
| 63 | HZX | HEGELER ZINC CO. | PWRC | ||
| 64 | HZZM | HAZZARD MOVING & STORAGE CO | SCAC4 |