| 1 | HAJ | Hajvairy Airlines | Callsign: Hajvairy, | PK | AVCODES |
| 2 | HAJ | Zhoushan Avic Joy General Aviation Co., Ltd. | Callsign: Dingchang, Name changed to Avic Joy General Aviation Co., Ltd. | PRC | AVCODES |
| 3 | HAJ | Avic Joy General Aviation Co., Ltd. | Callsign: Dingchang, Name changed from Zhoushan Avic Joy General Aviation Co., Ltd. | PRC | AVCODES |
| 4 | HAJ | Hajvairy Airlines | | | ICAO1 |
| 5 | HAJ | Hammel - Århus Jernbane (Hammelbanen) | 1902 - 1914 | DK | jernbanen.dk |
| 6 | HAJ | Haderslev Amts Jernbaner | 1899 - 1939 | DK | jernbanen.dk |
| 7 | HAJ | HARTSELL, JOHN J | | | SCAC4 |
| 8 | HAJ | Hajdú Volán | | H | TRAFFIC |
| 9 | HAJD | Haderslev Amts Jernbaner | Real: HAJ, 1899 - 1939 | DK | TRAFFIC |
| 10 | HAJK | HAJEK TRUCKING CO INC | | | PWRC |
| 11 | HAJK | HAMILTON, A JACK | | | SCAC4 |
| 12 | HAJM | Hammel - Århus Jernbane (Hammelbanen) | Real: HAJ, 1902 - 1914 | DK | TRAFFIC |
| 13 | HAJN | HAJNY, JON TRUCKING | | | SCAC4 |
| 14 | HAJT | HAJ TRUCKING INCORPORATED | | | SCAC4 |
