That's a LOT of greyhounds....
I may be able to give you a little help with the last leg of this, picking up somewhere in Virginia or North Carolina. I'm familiar with the breed -- my wife and I adopted two brothers after they retired in 1995 -- so I know that my airplane, a four-seater, wouldn't be able to take more than three dogs. Two males wouldn't fit in the back seat, but two females or a male and a female might -- the interior is about the size of that in a 1977 Honda Civic. One more could ride on blankets in the baggage hatch, which shares the same air as the cabin -- the divider is only as high as the seat back.
All of them would need to be harnessed to the seat belts or luggage straps. Let me know if I can be of help.
-- David Kenny DJK3737T@EarthLink.net