From what I understand - in extreme temperatures there is a moratorium on flying animals. That is the way it was when I flew Charlie Dog home from Florida to Texas. When the temperatures came down (I'm thinking they were in 90's still in September at that time) then the airline would take him. But I do get your point, and I'd rather not take chances, if there is a chance that it would be less stressful on Rosita to go by car. Charlie Dog made it, but he really was worse for wear, as they had a layover in Atlanta. Not good.