Delta and Alaska Air will end their current codeshare partnership effective from May 1, 2017.
The decision comes after Alaska Air’s takeover of Virgin America gives the combined business a much stronger position in the West Coast market , but Delta said it will continue to invest and grow services in the Pacific Northwest.
Delta operates more than 150 peak-day flights from its Seattle-Tacoma Airport hub, and will focus on creating more customer choice there,
"We view Seattle and the Pacific Northwest as one of the most important markets in the country, with strong economic growth, cultural diversity and some of the world’s most innovative brands and minds," said Mike Medeiros, Delta vice president – Seattle.
The end of codesharing will also mean customers are no longer able to earn and redeem miles on each other’s flights.
However a limited interline agreement between the airlines will remain in force.
The two airlines have had a tetchy relationship in recent years as they fought for dominance at Seattle.
"We have invested heavily in our product, services, facilities and the community. Our focus now is earning the long-term trust of Pacific Northwest customers by demonstrating the value of partnering with a global airline and the benefits of being a Delta SkyMiles Member," Medeiros added.
