Stubby writes:

I believe all U-2s have been retired. The satellite folks are winning
the high altitude intel game. Too bad the U-2 was a nice plane (glider?
rocket???).

The U-2 is still used, oddly enough (whereas the SR-71 is not, at
least officially).

It's a conventional aircraft, but with some characteristics and uses
that make it extremely difficult to fly. It is an aircraft with a
distinctive "coffin corner," that is, in a typical mission cruise
configuration, its maximum speed is only a few knots higher than its
stall speed, and if the speed is not precisely held within those
narrow limits, trouble results.

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