The increased price, up from $3.6 billion, is mostly because the project is growing in “scale” thanks to several additions made at the request of airlines, mainly Delta, to accommodate even more growth than previously expected, said Bill Wyatt, executive director of the airport.

“It’s gotten bigger,” Wyatt told KSL recently. “These are things we’re adding with the support of, and, in many cases, the request of our customers who are paying for it.”