Delta Air Lines will launch three new routes from Seattle and add flights and larger aircraft on existing routes this summer.
New flights from Seattle to Washington-Dulles and Kansas City start June 8. Flights to Indianapolis launch June 18.
It’s part of a plan to boost available seats from the Atlanta-based airline’s Seattle hub by 10 percent during peak day flight times this year, according to Tony Gonchar, Delta’s Seattle vice president.
“In 2012, we made a commitment to be Seattle’s…