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" ... Henne was determined that if any company were to build a supersonic jet, it would be Gulfstream. Key to a supersonic jet’s success, he felt, was its ability to fly supersonically over land without producing an audible supersonic boom. To this end, he and his team pioneered innovations such as the “supersonic spike,” a telescoping boom extending from the nose of a supersonic jet. It was tested on an F-15 and successfully mitigated supersonic boom by, in essence, softening shock waves. Gulfstream occasionally takes visitors into its supersonic boom simulator to demonstrate a low rumble, like distant thunder, versus the loud double boom caused by a traditional supersonic “N” wave. ... "
" ... Indeed, the late Gen. Chuck Yeager famously broke the sound barrier way back in 1947. Fighter jets have been flying supersonically almost every day for 60 years. And the famed Lockheed SR-71 Blackbird spy plane regularly flew north of Mach 3 – 2,300 m.p.h. – from the 1966 until its retirement in 1999. ... "