Just thought I'd post my experience when I took my Jazz bass to Wooten Woods, I don't think I've posted it in this thread.
I essentially decided to not trust American Airlines (who's website states that instruments go in the hold anyway), let alone their internal US flights! Tiny tiny planes.
So I took the neck from the body, took tuners off the neck, and basically stowed it in my main luggage case. The body was no issue, and the neck fit snuggly from corner to corner diagonally. I wrapped them both in clothes to protect further, as well as a cheap gig back wrapped up.
Got to hotel, rebuilt it, jobs a good'n.
No conversation with airlines, no worry about the bass getting through about.
Obviously not possible with neck throughs
Si