Q. about "Flight Level"

TeleTech wrote in
. 193.32:

[snip]

At the speeds used up that high, wouldn't I hear a sonic boom?

Not if they are subsonic.
Most classic jet aircraft cruise in the high 0.7-0.8 Machs.
Some cruise closer to 0.9 than 0.8 but thats not in the shock
producing region.
I used to lie on my back in the back yard with the radio tuned
to an air band. Every once in a while we'd hear a call sign
Speedbird ( British Airways ) reporting their altitude as FL5X0
to NY ARTCC. Only one airplane in the world that could be (Concorde)
By the time they would be below Mach 1 and no longer generating
a shock wave. So never heard a sonic boom.
Lived two years near Langly AFB and never heard a boom either

IBM

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