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@GA2G
One article I read put the max alt at 87,000 feet
http://birch.family.tripod.com/blackbird.html
But the others agree with you.
http://www.u2sr71patches.co.uk/sr71performance.htm
http://www.sr-71.org/blackbird/sr-71/
I still feel that the super cruise feature of the BAC EEL was extremely special, and a very farsighted development.
[ame]http://en.wikipedia.org/wiki/Supercruise[/ame]