Aber schön ist auch die Anekdote aus dem Buch "Sled Driver - Flying the worlds fastest Jet" von Autor und SR-71 Pilot Brian Shul:

"... Walt and I were screaming across Southern California, 13 miles high. We were monitoring various Radio transmissions from other aircraft as we entered Los Angeles Center's airspace. Though they didn't really control us, they did monitore our movement across their scope. I heard a Cessna ask for a readout of its groundspeed. "90 knots" Center replied. Moments later, a Twin Beech required the same. "120 knots," Center answered. We weren't the only one proud of our speed that day as almost instanly an F-18 smugly transmitted, "Ah, Center, Dusty 52 requests groundspeed readout." There was a slight pause. "525 knots on the ground, Dusty". Another silent pause. As I was thinking to myself how ripe a situation this was, I heard the click of a radio transmission from my back-seater. It was at that precise moment I realized Walt and I had become a real crew, for we were both thinking in unison. "Center, Aspen 20, you got a groundspeed readout for us?" There was a longer than normal pause. "Aspen, I show 1.742 knots" No further groundspeed inquiries were heard on that frequency. ..."

https://www.amazon.de/dp/0929823087

Skunk Works: A Personal Memoir of My Years of Lockheed