Until recently, U.S. domestic airlines had to offer both emotional support and service animals the same accommodations when traveling with their owners. But now that’s changed.

The Department of Transportation defines a service animal as a dog trained to perform tasks for an individual with a disability. In contrast, emotional support animals can be from a range of species and are meant to provide comfort to their human companions.

Individual airlines may now consider emotional support animals pets that require a paid ticket, while service animals still fly free. In addition, owners of service animals may need to submit a form before flying, which attests to their dog’s level of training.

If you have a service or emotional support animal, be sure to read about these and related rulings at www.transportation.gov before traveling.