Many airlines these days allow pets to accompany passengers in the main cabin rather than in the cargo area. Several major airlines limit the weight and number of pets on board to a maximum of 20 pounds per flight. Dogs that can fit securely into certified carriers beneath the seat are normally allowed to travel, albeit for a nominal cost. Thus, many animals, from ducks and pigs to puppies and cats, have been seen on planes, often leading to humorous situations.
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