The snowfall earlier this week that blanketed much of Western Washington created some problems for travelers. Flights were canceled or delayed at Sea-Tac Airport as crews worked feverishly to clear runways. A recent story in The New York Times described a way travelers can save themselves -- and the airlines -- some hassle. Some airlines will let you change your plans without the usual cancelation or rebooking fees, if you know the weather might make air travel difficult when you’re scheduled to