Originally Posted by biglinguist

Family members and I sometimes travel with guitars, so I'm very happy to see this. But I'm betting maybe one GA in a hundred will know about the rule allowing guitars as carry-on even if they exceed the carry-on dimensions.

As to the concern about people using instrument cases as giant carry-on luggage... maybe they'll make you open the case and play a tune? "Oh my God! Somebody has replaced my guitar with socks!"