On your upcoming trip, are you thinking about bringing along an animal other than your pet dog or cat? Frontier Carriers has more pet travel options than many other airlines, according to frontier airlines pet policy for one-way travel expenses, domestic dogs, cats, rabbits, farm animals, hamsters, or small house birds may be transported on flights inside the United States. Only domesticated dogs and cats are allowed to travel to or from other countries. Your pet must always remain in its transport container for their safety. Pets are not permitted to be checked as luggage.