Jet Blue offers a $299 Unlimited Pet Pass from Sept 5 through Dec 31 for small pets that will fit into their cabin in their carriers. Typically, this restricts a dog to about 15 pounds. Normally, the pet fee is $100 each way for a pet, so if you plan more than 3 segments during this time, it may be worth it to buy the pass. For more information see this Jet Blue Link. For an additional story on this pet pass see this link. For DogFriendly.com’s airline pet travel information, see this link.