text: FILE - In this April 1, 2017 file photo, a service dog strolls through the isle inside a United Airlines plane at Newark Liberty International Airport while taking part in a training exercise, in Newark, N.J. Delta Air Lines says for safety reasons it will require owners of service and support animals to provide more information before their animal can fly in the passenger cabin, including an assurance that it's trained to behave itself. (AP Photo/Julio Cortez, File