All the fuss from airlines about the so-called over-cautious approach of NATS seems to me to be geared to trying to strong arm compensation out of the government rather than a sound basis of science
I keep looking at the Met office maps.
One maps shows satelite imagery of teh volanic ash plume.
Another shows the no-fly zone predictions
So just how dangerous is it to fly though this ash? This news report from the BBC gives some details.
If one airliner in a hundred has total engine failure due to volcanic ash, then that seems to me to be a pretty big risk. The risk not only impacts the crew and passengers but in crowded Europe, the risk of a crash on an urban area can not be ignored.
Would you get on a plane if you thought there was a one in a hundred chance of engine failure. I wouldn't.