The U.S. Department of Transportation released a statement that forbids airlines from banning dogs based on their breed. The new rule applies specifically to service animals, or animals. It instructed airlines that they must allow any breed of service dog on board.
Last year, Delta banned all pit bulls from flying, regardless of whether or not they were certified therapy animals. United Airlines also banned pit bulls last year, along with 20 other dog breeds, including pugs, bulldogs, mastiffs, and shih tzus.
Source: mental floss.com