There are several forums that should try posting this request on, though perhaps you have already done so.

911PetRescue has two forums that meet your needs. One is Urgen and the other is Transportation. Most of the people on the forum live either in the Mid-West or East and they are very experienced at arranging transport. They are also very generous - perhaps one might take one of your cats?!

There is also Frappr, and there is a link for this site from 911PetRescue. You can look at a map and select volunteers for the route Angel needs to take. It will be up to you to contact each volunteer and coordinate the journey.

Best Friends does not have a lot of traffic compared to PT and 911, but they are very helpful. There are a couple of forums that deal with transportation.

Post widely, that's your best chance. From what I've seen, it's much easier to get a transport going east, or even south, than going west.

If you decide to fly any of your cats, Continental is the airline that Best Friends uses because they take their reputation of being a good pet carrier very seriously.