Alaska Airlines and Hawaiian Airlines are moving forward with their integration process, which began after the two companies finalized their merger in September 2024. The US Department of Transportation (DOT) approved Alaska Air Group, the parent company of Alaska Airlines and Horizon Air, to take over Hawaiian Airlines’ operating certificates, international services, and codeshare approvals earlier this summer.
One major step in this process is the transition of Hawaiian Airlines’ IATA code from HA to AS. After 96 years in service, the HA code will be retired on April 22, 2026. Before that date, starting October 26, 2025, Hawaiian’s flights will temporarily use a new numbering range (HA800–1299), according to schedule data filed by Alaska Airlines and confirmed by AeroRoutes.
Flight numbers for international routes will shift from the current 4XX series to an 8XX range. For example, the Honolulu–Osaka Kansai route will change from HA449/450 to HA849/850. US mainland flights will move into the 8XX–9XX block while inter-island services transition from the 3XX block to numbers between 1000 and 1299. This restructuring aims to prevent overlaps as both airlines prepare to operate under a single IATA code.