answer:I don’t know, but you can always ask the airline. I do know a musician who purchases a seat for his cello when he flies to do a concert (he even straps it in place. This is because he does not want the baggage handlers to get their hands on it. If your guitar is that valuable and you have no other option, buy the extra seat for your guitar. Of course, the other option is to purchase a hard case (airline worthy) and insure it to the hilt. Make sure you have either a current appraisal or a receipt showing how much it’s worth, and send it as baggage. If it is damaged and you don’t have a receipt, the insurance company will laugh at you when you try to collect.