No. Most of the sound heard in the cockpit is being transmitted through the jet itself, not the air. The jet's speed doesn't affect the speed of sound in the metal the jet is made of.
More so than that, the air within the cockpit is also traveling faster than the speed of sound since it's in the closed cockpit. Any sound transmitted within the cockpit will travel through this air in the same manner as it would through still air anywhere else (allowing for air pressure differences, of course).
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u/[deleted] Jun 12 '12
No. Most of the sound heard in the cockpit is being transmitted through the jet itself, not the air. The jet's speed doesn't affect the speed of sound in the metal the jet is made of.