Each airline has its own rules for whether or not pets can travel in the cabin of the airplane. If the airline allows pets to travel in the cabin, the pet container is considered an item of carry-on baggage and must meet the appropriate requirements. Check with each airline about their procedures and policies.
Emotional Support Animals
Emotional support animals may be taken out of their carriers provided that the passenger furnishes documentation, within the last year, from a certified mental health physician. There is a limited number of emotional support animals allowed on a single flight.