I'm trying to get my daughter home in early December. She's flying from SCE (State College, PA), and would be changing planes in either DTW, IAD, or PHL. I'm looking at one flight that has a layover time of an hour and 20 minutes. Considering the time of year and the likelihood of crummy weather, is that a long enough time to deal with most delays? I'd hate to see her stuck in the airport.