If the "Dash One" manual for the military airplane specifies a speed higher
than 250 below 10,000' it's OK to fly that fast. In the B-58 Hustler, after
takeoff we came out of afterburners at 350 KIAS and climbed at 425 KIAS
until reaching Mach .90 for climb speed. That's why other aircraft try to
stay clear of military climb corridors. We flew low level routes at 435
KIAS except for the high speed portion where we flew at 600 KIAS. (and
that's back in the 1960s)

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B-58 Hustler History: http://members.cox.net/dschmidt1/
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"Tetsuji Rai" wrote in message
s.com...
Airspeed limitation below 10000ft is usually 250kts unless you have been
authorized by the Administrator. However I guess it's a bit slow for
military fighters. So I am curious how fast military fighters fly in the
real world. I guess it's very dangerous military aircraft fly much fast
among civilian planes.