1-888-595-2181 Delta allows passengers to travel with a carry-on pet on a few routes and cabins with restrictions. The pet must be at least 8 weeks old for domestic travel. For international travel, a pet dog must be 6 months old and a pet cat must be at least 16 weeks old. Delta has a first-come first-serve policy when it comes to adding a pet. Since the number of pets allowed in the... https://www.holidayglobes.com/blogs/how-do-i-add-a-pet-to-my-reservation-delta.aspx