Never taken a BB on a flight before, but there shouldn't be much difference to a "normal" rta
The problems arise ( as said before ) due to the differences in air pressure.
I've taken many a tank onboard flights throughout Europe and the secret to non leaking is to either have an totally empty tank or a totally filed one with no air bubbles in it at all.
I've never had any problems, but as Carrion says above why not just use a dripper until you get to your destination.