Before GPS got hyper accurate and cheap I’d have multiple light aircraft and airliners ask their ground speed a day. I think it’s been maybe 5 years since somebody asked for their ground speed now. Nowadays airliners and private pilots know exactly how fast they’re going.
The SR71 is badass but there is a bigger classified fish in the pond. I’ve got friends who worked Air Force in Europe and they routinely would track a target heading towards Russia at Mach 5+. No beacon so no altitude information, my guess is lower space (100,000 feet or above).
Not surprised, it was years before the Blackbird was ever acknowledged.
Someone’s comment, how true.
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