There was a thread about this not so long back. Kimi Reith can't have travelled in a plane recently (read "within the last 6 months", never mind since 11th Sept), or he/she would know that checkin has maximum weight and dimensions restrictions for carryon luggage - no exceptions. This "courtesy to musicians" is actually dead and buried, so asking about it now is flogging a dead horse.

I'm not sure where Kimi would suggest putting a guitar in a plane either - the only solution I could think of is buying an extra seat for it. Certainly a guitar in a hard-shell case won't fit in an overhead locker.

Graham.