There seems to be a fair number of people calling for re-opening of the airspace, so how about they all pop on board a BA 747, and go flying for a few hours in the ash and let the rest of us know if its alright?
Personally I find it worrying that in the face of extreme doubt, there appear to be people in positions of responsibility who are behaving like cowboys with regard to safety. Reassuring... Not.
Actually, we are calling for a test aircraft to do this, so we know if it is safe to put passengers onboard and do the same. And then to check each aircraft every day to see if there is a problem. (Do a thread search for "two engines". And yes, I would do it - just give me the 747 rating
)
If Orville and Wilbur had taken your position, we would never have gotten airborne in the first place.