On American Airlines, pets are accepted in the cabin, as checked baggage, or transported with American Airlines Cargo. Cats and dogs are the only types of pets accepted on American Airlines. Pets in the cabin are accepted on flights within the 48 contiguous United States, Alaska, Puerto Rico, St. Thomas and St. Croix; and to or from the U.S. and Canada, Mexico, the Caribbean, Central American and some destinations in South America provided the country of arrival permits entry. Pet cabins, where pet owners may easily secure a carrier, with a pup or cat inside, are available in first class only. There are two cabins per plane, each accommodating one four-legged flyer, on select flights between New York (JFK) and Los Angeles (LAX), and JFK and San Francisco (SFO). Carry-on pets are not allowed to/from Hawaii or transatlantic/transpacific destinations or to/from Argentina, Bolivia, Brazil, Chile, Uruguay and Venezuela. Pets will not be accepted for flights over 12 hours or on flights traveling to the United Kingdom. American Airlines requires a health certificate for the acceptance of pets for travel as checked baggage. Valid health certificates must be issued by a veterinarian. Checked pets will only be able to connect through a hub city. Certain dog breed restrictions apply; American Airlines will not accept brachycephalic or snub-nosed dogs and cats as checked luggage. Checked pets cannot be accepted when the current or forecasted temperature is above 85 degrees Fahrenheit (29.4 degrees C) or below 45 degrees Fahrenheit (7.2 degrees C) at any location on the itinerary.