Mach 1 nearly exceeded?


#1

Today (8/25/17), AA 60 flight data showed that at one point the aircraft was operating at 682 mph at 35,000 feet. At that altitude, isn’t that dangerously close to exceeding the speed of sound?


#2

Never mind. I just learned that breaking the sound barrier depends on air speed, not ground speed. If AA 60 had a large tail wind, it’s airspeed was probably not very close to Mach 1.


#3

It’s too bad http://groundspeedrecords.com/ is down now, it had a lot of photos of high groundspeeds in various aircraft.


#4

The site is up for me. The latest commercial speed they give is an A380 at 675kts=776mph