Dog chewing bone. U.S. airlines began changing the rules earlier this year, especially for emotional-support animals, after passengers brought not only dogs and cats but turkeys, goats, snakes and pigs onto planes. Delta flies about 700 service animals per day, a 150% increase since 2015. (Photo: Shutterstock)

Delta Air Lines Inc. is barring emotional-support and service animals that are less than four months old, while banning all support animals from flights longer than eight hours.

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