That's not what is at stake here though. CVRs are not intended for improving process like a call-center recorded line. "Both recorders are installed to help reconstruct the events leading to an aircraft accident." [ntsb.gov]
This creep of intended-use is exactly why many people oppose surveillance in the first place.
I don't understand. You're saying that the purpose of cockpit voice recorders is not to improve aviation safety via allowing a thorough investigation of accidents? If there is any other purpose, I don't know what it would be.
This creep of intended-use is exactly why many people oppose surveillance in the first place.