I found this idea online, and thought that I might be an interesting way to protect your flutes during air travel. The article basically presents the idea that the TSA has to lock any baggage which includes a firearm while it's enroute. AND they provide extra tracking to ensure that the baggage arrives!! Most interesting is the fact that a starter pistol (the kind used to start track meets, are also considered firearms. For those of you opposed to owning weapons, (or even for those of you who do own weapons, but don't want to bring them along) this might be a viable alternative.
So the next time that you have to travel via air to a flute event, and you have to check your flute bag, you might consider this idea. Here's the link for the article.