Delta Air Lines has been adding new routes to and from Seattle-Tacoma International Airport. Starting with announcing new service to Tokyo-Haneda, they have announce service to Shanghai, Memphis, Los Angeles, and just recently to Las Vegas and Anchorage. I might be missing a few they have announced.
Same with Los Angeles International Airport. They have announced service to Boston, Nashville, Raleigh, Anchorage, San Jose, Seattle, and Spokane. Maybe be missing some destinations again.
Is Delta adding new routes to and from these airports because of a potential market, or is Delta opening up a hub in the near future?