I'm not flying United, I'm flying KLM. Still, would it be unwise to bring my guitar?
It looks like they will probably let me bring it as hand baggage, "provided it fits in the overhead bin". But if they don't... aiee! It is a very nice guitar, and I don't want to trust it to the hold.
Anecdotal stories across the net seem to indicate that most of the time they will allow a guitar as hand baggage, but every once in a while they will force it to be checked. Please, please, KLM, do not force me to check it.