Locals and visitors know Louis Armstrong New Orleans International Airport (MSY) as a place where you can get a beignet while being reminded by multiple advertisements that New Orleans is No. 1 in liver transplants. Built in 1959, the airport’s domed, ribbed arrival hall feels reminiscent of a whale’s belly. But aesthetic concerns aside, the aging airport posed security issues and incurred mounting maintenance costs. Come May 15, MSY will boast an airy, futuristic new terminal on its north side. Designed by architect Cesar Pelli and the Crescent City Aviation Team, the 35-gate terminal is 90 percent complete.