Human Rights Watch report on the men detained at "undisclosed locations" by the US intelligence services. (Thanks to Nick Barlow)
[Unfounded Speculation]I have a little theory about this, which I won't push too hard without corroboration. If you had to move prisoners around the world secretly, wouldn't a couple of aircraft not belonging to the government, unmarked, and registered under a flag of convenience be useful? You could always book the bill to some other major operation.