I find the SR71/A12 to be the most impressive aircraft I've ever heard of, an ENORMOUS technological achievement for its time. I heard an interview with a '71 pilot. He was overflying Libia after the US bombing in the 80's to do bomb damage assessment. They were flying in shortly after the F111s had left the airspace and the Libian airspace was hot, the air defenses were fully woken by the previous bombing.
Anyway, he was quickly fired on by a SAM and decided to simply outrun the missle. He put the throttle to the stops and accelerated, leaving the missle behind. Yikes. Shortly after his back seater informed him he was flying "outside the envelope", going faster than the plane was rated to go. The pilot implied that nobody really knew how fast the '71 could go, and even though he was flying the plane faster than anyone else ever had he said it felt like the plane could go much, much faster.

How cool is that?