I’d like to tell you a little story:
I normally travel light; just my backpack with a few clothes and my guitar, sometimes if I’m staying abroad for longer I will pay for the extra baggage allowance and take a suitcase. I was at the check-in getting my boarding pass (on a flight from Munich to Greece) and the attendant asked me about my guitar. “Is that for checked luggage?“
“Can I take it on the plane or check it at the plane please?” I asked.
“No it will have to go with bulky luggage but first I need you to sign a waiver”
I asked what the waiver was for and she told me I would have to sign it to absolve the airline of any responsibility should it get damaged in transit… I looked at her for a second and replied with a hint of sarcasm “Why would I sign that then?”.
“Well, If you don’t sign it you can’t get on the plane”
I could feel the anger swelling in my soul… I remember asking her what kind of airline adopts such a bullshit policy and asked for the manager like a total Karen. The supervisor came over, looked at the screen and simply said “No, it’s fine you don’t have to sign anything it's already part of your baggage allowance”
If this ever happens to you too. NEVER sign that waiver. It would be totally unacceptable for an airline to force you to do that under threat of cancelling your flight. No one wants the hassle of missing a flight but imagine getting to your destination and finding your guitar in broken pieces.
In any and every case, please make sure your guitar is INSURED!