I flew with my cat and cockatiels about 15 yrs. ago. They had to be in those hard plastic pet carriers, the kind they sell in pet stores. Of course, the birds were in a seperate carrier from the cat...although they were friends, I don't think they would have flown well together. Call the airline to see what policies are now though. When I had mine, the airline allowed two passengers to take animals in the cabins as long as the carriers were small enough to fit under the seat...my animals had to go in with the luggage because 2 other passengers already had checked in with their dogs.