Delta says it hasn't figured out how to ensure passengers' safety around pits bulls, so it's continuing a ban it imposed last year.
Delta says it had more than 40 cases of aggressive animal behavior on planes last year. A Delta passenger was mauled badly in 2017, although the dog was a lab-pointer mix.
Kitty Block, president of the Humane Society of the United States, calls the ban discriminatory and misguided. The American Veterinary Medical Association says any dog can bite, and regulations aimed at specific breeds aren't effective.