Terminal expansion underway at Billings Logan International Airport Hopefully complete by December 2021 Billings Logan International preparing for busy, post-pandemic summer and last updated 2021-05-11 21:06:08-04 BILLINGS â About a month before the busy season takes off at Billings Logan International Airport, construction workers are making headway on phase two of a $60 million terminal expansion project, said Kevin Ploehn, airport director of aviation and transit, on Tuesday. "It's starting to come together. This is phase two. They'll get this piece completed, then hopefully we can move everybody from the old B concourse into this new area, then we'll start making the new B concourse look better," Ploehn said.