If you're referring to the B & W case, I got one from Calhoun Cycle (it was a few years ago and ASFAICS they were the only US source).
I have flown with it numerous times and it worked flawlessly every time (no extra airline "bike" fees and no damage to bike).
Just to be clear, this is the case I'm referring to:
http://www.calhouncycle.com/productc...idproduct=1252
I'm not aware of a trailer solution, but it's not anything that I've looked for. I do business travel and use the bike to explore in the evenings.