Most airlines allow one or two checked bags per passenger, for no charge. I am certain this is the policy of Northwest Airlines.

Airlines also insure checked bags, typically for up to a value of $2500. You can purchase insurance for more, if you need it. You can get all that detailed info at the counter - and usually via telephone from the reservations number - though you'll have wait and wade through the computer menus (call late in the evening, you'll probably get through quicker).

It is unlikely you can carry the instrument on-board, but possible. That's up to security and the airline. I wouldn't bet on it happening, though.

Assuming you have a hard shell case, your instrument should be just fine in baggage. I know it's commonly practiced by some to loosen the strings, but Larrivee says DO NOT loosen strings, the instrument is designed to be strongest when it's tuned. All seem to agree that packing the head of the guitar with newspaper (or something) will keep it from being bounced around - and therefore protect it against breaking.

I've carried my instrument frequently in baggage. They always go tuned, heads packed - and I've never had a problem. BUT I would never ship an instrument I couldn't replace. Assume the worst is you'll get the instrument replacement cost - if you can live that, baggage will most likely work out for you!

All the best at IBC. Sounds like a good trip!