Soon Delta Air Lines will require additional documentation for passengers taking service animals with them on flights. This comes amid an increase of incidents involving animals, including a dog attack last year.

Starting March 1, customers will have to show proof of health or vaccinations for their animals 48 hours in advance. In addition, owners of emotional-support animals will need to sign a statement confirming their animal can behave. However, the new requirements don’t apply to pets that stay in kennels during flights.

Delta’s new rules are aimed at two different types of animals. The first are service animals, which receive specific training to help blind or disabled passengers. Then there are emotional-support animals, which require no training at all. Both fly for free and are not required to be caged during the flight.

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