Not only are this plane’s wings made of plastic, they inflate like a balloon . . . in midflight. No, it’s not some daredevil stunt; it’s a NASA plane that may someday be dropped from spacecraft orbiting other planets. During a successful flight earlier this year, a nitrogen canister inflated the I2000’s 32-inch-long wings in a third of a second. It marked the first time an aircraft’s wings have ever been inflated in flight.
http://www.popsci.com/bown/aviation_51_wing.html