roy that sounds far too much like a real scientific exp that could give out useful data!- much better to just send planes up willy nilly with no data instruments and bring back down safely to prove all is ok. Then we can open up safe paths through ash- that change hourly so that pilots and passangers can all go on mystery flights taking off with no idea exactly where they will land if the parting of the ash moves abit. So much data recording time to planned sets of exps has been lost already.