Emotional support animals no longer free of charge on airplanes. A ruling from the U.S. Department of Transportation (DOT), effective January 11, 2021, allows airlines to limit the type and number of animals permitted in the passenger cabin and narrow the category of service animals permitted to fly for free. Service animals are now defined solely as dogs, including psychiatric service dogs, "trained to do work or perform tasks for the benefit of a qualified individual with a disability." All other animals are designated as pets. The ruling comes primarily in response to flight safety concerns, with numerous reports of so-called emotional support animals from a wide range of species misbehaving and, in some cases, endangering passengers, flight personnel, and bona fide service animals. Additionally, DOT cited in its ruling the increasing incidence of passengers "fraudulently" claiming their pets as service animals. By law, airlines cannot charge passengers for transporting service animals, but they can for pets.