Seattle-Tacoma International Airport's new expansion of Concourse C opened today in grand fashion. (opens in new tab)

Seattle-Tacoma International Airport's new expansion of Concourse C opened today in grand fashion. The project reconstructed the area where Concourses C and D meet by adding four more floors to the building's original three floors. The nearly $400 million construction project was approved three years ago. The atrium area, called the "Tree at C," features grand seating and a performance area for live music. A host of new restaurants and shops also greet travelers, along with an outdoor viewing...