Don't know if you have seen this video. Its James May( from Top Gear) getting a ride in a U2 Spy plane. http://www.youtube.com/watch?v=x6cZLfK4Zjk
They get some killer footage of the blackness
There was a guy, I belive in the UK, who did something like this last year but with a cheap digital camera and the pictures were actually pretty amazing. Very cool that these can be retreived fairly easily