maybe i wasnt totally explanitory. it was a big acoustic guitar case for a juggernaut(REALLY BIG GUITAR) it was a 20" wheel and the cranks just fit in...i had to take off the pedals and seat. thats all.
For a single unicycle I still stand by my method which John Foss dubbed "the naked unicycle" technique.
I just take the uni (fully assembled) through the airport to the gate where they check it at the gate. In the SLC and Boston airports I've even ridden through the airport. Though I got some strange looks from some, no airport "officials" had a problem with it (well only a little problem but that's another story).