Not much, I'm afraid......a friend of mine was offered a -200 in 2001, and was on the point of buying it for $ several million when 9/11 happened. By Christmas the same ship was on offer at 600k. Even for a freighter, the potential forthcoming noise regs, ageing airframe issues, etc. make for a very limited future. Africa's probably the best place for them, where they will bash out the remainder of their lives, a bit like the 1-11's and 707's before them.