Any way to download single aircraft for Real Flight 6? I'm looking to see if there is a B-17 or other warbirds to download.

You Bet. Just go to their web site and search for the download of your choice.

go to knife edge fourums and find the swap pages on there. Type in "b-17" in the search box and see whet come up. One with "EA" somewhere in the title is the one you want