Q. about "Flight Level"

"D. Strang" wrote in
news:q4IIc.23480$r3.15887@okepread03:

"gary pearson" wrote

I don't know if they're audible to the human ear at that height,
but you probably couldn't hear them over normal background noise
anyway.

Not a chance at FL 400 and very unlikely even at FL250.

Hogwash. I hear them every day. As a matter of fact, I hear them
about 20 miles after they pass overhead. You have to look where they
might be now, instead of straight up where you hear the sound.

Shock waves are funny things. They can reflect and travel long
distances. There were reports for years of mysterious
"sonic booms" on the east coast of Canada for many years which
I believe have a weak but not insignificant correlation with
Concorde schedule.

IBM

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