Symbolizing the spirit of launch customer Alaska Airlines, Iditarod sled-dog race champion Doug Swingley and his team escort the first Boeing Next-Generation 737-900 out of the factory for its world premiere. Boeing and Alaska Airlines and employees cheered the airplane at a rollout celebration in Renton, Wash. The Boeing 737-900 is the newest Boeing commercial jetliner and the largest model in the Next-Generation 737 family.