In an interview with The Oregonian newspaper, Alaska Airlines President Brad Tilden addresses questions of airline fees, environmental efforts and international expansion. Tilden says his carrier operates a sort of hybrid hub-and-spoke/point-to-point model, and that flights to or within Alaska represent a quarter of the airline's business. Tilden also says he's unconcerned with recent volcanic eruptions that cost the airline millions because of canceled flights. "We have $1 billion in cash on hand, which is way higher than other airlines," he said. "We try to build a very rugged company for those kinds of events."