I am currently in Japan on an award ticket booked with United miles and, in theory, flying home tomorrow to JFK on ANA first class... except the snowstorm is headed that way. Assuming something happens to the flight and I need rerouting, whom do I go to first: United, or ANA? Would I need to find something available as a Saver award seat to get rebooked, or would they send me on any Star Alliance plane they can find? Would I be able to insist on at least business class (I'm willing to extend my vacation a day if I have to... there are worse things!) and, presumably, United would simply refund the difference in miles in such a downgrade case?