.....I have a solution!
See Post #40 at:
http://www.flyertalk.com/forum/showthread.php?t=353408
It is 'kappa's pet peeve' that most people don't realize it is not necessary to talk at conversational volume into a microphone right in their face.
I could rant on this subject forever...... but if airlines ever permit in-flight cellphone use, I am prepared to stop it within my earshot!