"Pets don't like to fly. They don't like to be crammed into tiny kennels; they don't like the changes in air pressure, smell, and air quality that take place on a plane; and they certainly don't like to be tossed into a miserable, dark cargo hold. Many veterinarians advise that, especially on short trips, you should leave your pet home with a pet-sitter or a veterinarian's boarding service.

But if you insist upon taking a furry friend on board, the safest way is to bring your pet as a carry-on item in a suitable carrier. Common pets (see below for types and airlines) are allowed on flights within the United States, provided that you make an advance reservation for them. Be sure to ask the deadline when you book. In order to qualify for the cabin, animals must be at least 8 weeks old, fully weaned, under 20 pounds, and healthy. The airline will usually ask you to furnish a clean bill of health from a veterinarian, prepared within 10 days of your departure. On some airlines, you may be asked to present certification that your pet has been vaccinated against rabies, especially for dogs.

Larger pets must be checked as baggage or travel as cargo. Pets checked as baggage received the same treatment as any other bag -- placed on the trolley, handled by the usual baggage handlers, and put in compartments with other bags. Airlines will assure you that these baggage compartments are pressurized and heated, but if the airline screws up you can't sue them; your pet qualifies only as damaged baggage.

Using an airline's cargo service is more expensive, but generally provides a plusher experience for the pet. The cargo area is legally required to be pressurized and heated, and the pets are last on and first off the plane, so they spend less time on the tarmac then pets checked as baggage.

In all cases, reserve space for your pet well in advance. Airlines all have restrictions on the total number of pets they can take in a cabin or as checked luggage, and it's first come, first serve." [Via frommers.com]

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