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I read with interest Fred Moreno's input on TAS corrections.  I flew the
SR-71 for over 8 years and we were obviously subject to major errors in the
pitot static systems at Mach 3.  In fact we disregarded  those systems after
going through Mach 1 and reverted to a computerized, digital readout
instrument called the TDI (Triple Display Indicator).  It provided us
corrected data for KEAS (knots equivalent air speed), Mach # and altitude.  
KEAS became our "indicated A/S" while supersonic.  Compressibility at over
Mach 3, and skin temperatures of over 800 degrees F, call for LARGE
corrections.  Fortunately, my little 235 works just fine with pitot static
stuff.  Pat Halloran
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