I've carried my rig on board several times, departing from Geneva to Stavanger and Stavanger to London (July 2005)... as well as through a couple more countries in Europe. Never really seemed to have a problem. Mind you, it was a small 225 canopy inside, hence was not overly big!!
I'm about to try again to get to Norway from Oz.... Otherwise I'll have to re-organise the luggage in a hurry :)
plummy