Frontier Airlines announced earlier this week that it will start allowing customers to bring small pets into the cabins aboard its planes for $75 each way. Although that might seem convenient, it's important to note that that's more than the low-cost airline charges humans for some flights.

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Pets that qualify -- small dogs, cats, rabbits, guinea pigs, hamsters and small birds -- must remain in a carrier that will fit under the seat in front of passengers, and customers must supply up-to-date heath documentation for their animals.

Larger pets still can fly as cargo for $150.