I agree with flyf15 about the MD-80s for the shuttle. The shuttle fleet is just 12 strong, so that would be an ideal use for them. By the way, several years ago, I think it was in either ACAR or its predecessor, NAAN, that the USAir 767s and MD-80s were endangered species, that both would be gone within the year. How wrong they were.
Fly Eastern's Golden Falcon DC-7B