Atlanta-based Delta Air Lines continues adding new cities in its quest to build a small hub in Seattle.
The airline Wednesday filed paperwork to begin flying between Sea-Tac Airport and San Jose, Calif. next September.
That route is another of Alaska Airlines' West Coast mainstays. Alaska now competes with Southwest Airlines on that route but has the majority share of passengers.
Delta said it will begin flying from Sea-Tac to San Jose four times daily beginning in mid-September. The airline will fly the route with 90-passenger regional jets. Alaska flies between Sea-Tac and San Jose with full-sized Boeing 737s that carry from 145 to 172 passengers.
Delta in recent months has begun creating a network of domestic routes from Sea-Tac nearly duplicating SeaTac-based Alaska's network. Delta, the nation's third-largest carrier, has added flights from Sea-Tac to San Diego, Los Angeles, San Francisco, San Jose, Las Vegas, Portland, Vancouver, Juneau and Anchorage, all of which are served by Alaska.
Delta service to many of those cities won't begin until 2014.
Delta says it needs the domestic routes to feed its growing schedule of international flights from Seattle. The airline now flies to Beijing, Shanghai and both of Tokyo's airports from Seattle. In Europe it connects Sea-Tac with Amsterdam and Paris.
Beginning next year, Delta will add flights to Hong Kong and Seoul and to London.