ATLANTA -- If you're planning a flight longer than eight hours, Delta Air Lines says you can't bring an emotional-support animal with you.
The rules for pups are getting tighter too. Neither support animals nor trained service animals will be allowed on any Delta flights if they are under 4 months old.
Delta says the changes take effect Dec. 18.
The airline says exceptions will be made until Feb. 1 for customers who already bought a ticket and asked to bring a support animal.
Airlines are tightening rules on animals, saying their numbers have skyrocketed and some have relieved themselves or bitten other animals - and in one case, a Delta passenger. People who fill out the forms to travel with a support animal avoid pet-carriage fees.
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Delta: On long flights, leave your support animal at home
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