"Darrell" wrote in message
news:5vBQb.65145$XD5.52941@fed1read06...

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)


I believe military climb corridors ceased being charted in the sixties as
well.