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One of my tenor 'bones came with a Pro-Tec semi-hard case. It's a decent case but I would not trust it to an air cargo hold.

You may want to run this query on www.tromboneforum.org. There are many threads there dealing with trombone travel.

OR - read the 'Musings' section on Ferguson's website www.hornguys.com - Steve has a whole section on this topic that I find very informative.