Brachycephalic (Snub-Nosed) dogs and cats are very sensitive to high temperatures and will not be accepted when temperatures at any point on the planned itinerary exceed 75 degrees Fahrenheit (24°C).
The following breeds are included in this restriction:
American Straffordshire Terrier
Boston Terrier
Boxer
Brussels Griffin
Bull Terrier
Dutch Pug
English Bulldog
English Toy Spaniel
French Bulldog
Japanese Spaniel (Japanese Chin)
Japanese Pug
Pekinese
Shih Tzu
Straffordshire Bull Terrier
I don't really think of the Pit Bull as having breathing problems anywhere near that of a Pug, EB or Peke.
And they should definately add the American Bulldog (Johnson type) to their list!!!