Hi len -- it sounds like you are already on top of things regarding PETS. Just to double-check, here is a great thread you can go over if you haven't already, to make sure all your ducks are in a row ---
http://talk.uk-yankee.com/index.php?topic=22296.0There's a Part 2, be sure to check over that too, against what you've done so far for your Akita's PETS process. The last few bits coming up for you is probably the health certificate showing "fit to fly" status, to be issued no more than ten days before actual travel, and tick and tapeworm within 24 hours of travel.
As for the issues developing, I think only your vet can help you decide, having examined your dog and seeing "in person" how things are. One good thing in your favor is that, flying from NYC, you have about as short a flight as can be, which must help. I was flying with my cat from Texas, making for a much longer total journey time my cat had to endure; a shorter time in the air hopefully equals less stress for the animal.
But let you vet help you in this decision. There's a lot to weigh -- she's older and it may be kinder not to put her through the stress, yet then again, she may equally be caused stress and emotional distress by losing yet another human she has bonded with.
One thing to know is that the conditions in the animal section of cargo are not as rough as we imagine -- the animal area is separate from the luggage cargo, and is pressurized and climate controlled with the same air that is circulated in the cabin. There is a public perception that the animals are allowed to be "in with the luggage" freezing and gasping for oxygen -- this is not so!! They are in good hands both in the physical space they occupy in the hold, and in the care they receive at both ends of the journey checking in and being processed out. Hope this helps you to know that if you do decide to go ahead, you dog will be in good hands at least.