Why don't you just ask your host if you can stay two nights?? I did it twice without a problem. Just do something nice for them, since they're going to the trouble of housing you for an extra night. Buy them a drink, give them a nice card with a starbucks gift certificate inside, make them dinner. Sure, these little gifts will cost you 5 or 10 bucks, but it's better than spending the night in an airport. Plus, you get spend more time with a student and, hopefully, learn a little more about life at that school.