I'm possibly looking to put a very long flight together from Santa Rosa CA to Salt Lake City, stay overnight. Then pick up two pups traveling in carriers, fly to Boise to pick up a dog, then back to Northern Calif. I could fit another dog in at Boise. I'm in an Archer so it might be best if I pull my rear seats and put the dogs in carriers, but if the adult dogs get along I could probably have an adult dog in the rear seat with a pup in a carrier and another adult dog in the back baggage area with the other pup in a carrier. Yours is a big dog so I need to really look at how to make everyone comfortably fit. The entire flight will be spread over two days (maybe three) with about 14 hrs with ground time to refuel.
I haven't finalized this ambitious journey but the more rescues I transport in one trip the more worthwhile my effort. If you want me to add your dog from Boise let me know. If you know of any dogs leaving Northern California going towards Boise or Salt Lake City then I could fill my outbound leg also.