We could not fly transport our puppies to a out of state buyer because of the heat of the summer prevents flying mastiff (short nose) type dogs when temperature is over 70 degrees. We were even informed that if they arrived at the mid-point terminal and it was over 70 degrees, we would have to go up and pick them up (over 800 miles round trip) or pups would go to a shelter, good thing I found the uship, ground transportation was a snap. safe and cheap.