If you and a friend were in the cockpit of a SR 71 Blackbird traveling
at a speed of 3.2 mach, would you be able to hear eachother speak with
the naked ear.  (this is obviously assuming that both of you do not
have suits of any type on, and this is a completely pressurized and
sealed cockpit)  ???

Yes. The air in the cockpit is at rest (net) with respect to the
pilots, similar to the air on the moving earth.

Yes, the two of you could carry a conversation within the cockpit.
Consider it this way. Have you flown on a commercial airliner? They
fly at about 600 mph, which is in the neighborhood of 80% the speed of
sound, sea level in air. But when you speak inside the cabin there's
no doppler shift. That's because the air inside is being propelled at
the same speed as the rest of the aircraft. Inside a plane traveling
at greater than Mach 1, it's the same situation; the air in the cabin
is also traveling at the same speed, and sound waves in the cabin are
traveling at Mach 1 + the speed of the aircraft.

There would be no doppler shift if you were outside the plane and the
wind was blowing by you at 600 mph either. (but it would be very
noisy!)

Since the relative velocity of the source and receiver is zero, there
is no way the frequency of the sound can be different (notice I did
not say anything about the wavelength).

"There would be no doppler shift if you were outside the plane and the
wind was blowing by you at 600 mph either. (but it would be very
noisy!)"

   Yes, you're right about that. Thanks. Although it might only be
noisy just long enough for my eardrums to blow out. After that, it'd
be perfectly quiet! :)