Fuji
Sorry to disagree, but Drysuits are great on a dinghy in winter, but not many peoiple use them in summer, as you really require a regular dousing with cold water to keep the temperature in the suit down, having used all the latest kit the breathable ones are pretty good but if you walk indoors you overheat pretty quickly, so in a plane you would boil in the bag quite nicely! Why do you think the diver/winch crew fly round with the door open on SAR helis all the time(Joke)
They are not to cumbersome though, but the heat would be the problem.
Regards
Hover Bover