Delta Air to tighten rules for onboard service animals

Delta Air Lines is tightening the requirements for passengers traveling with onboard service and emotional support animals, the carrier said on Friday, following a sharp uptick in pet-related safety issues in recent years.Effective March 1, Delta, the second largest U.S. airline by passenger traffic, said it will require passengers seeking to fly with pets to present additional documents outlining the passenger's need for the animal and proof of its training and vaccinations, 48 hours prior to t