There may be a clue in the silence
S76, I disagree and I take my clue from the silence from the airlines themselves. Not a peep from Cryan or Squeezy, let alone the network airlines. They cannot be happy - expenses through the roof and refunds flowing out the door - but they aren't going to risk the reputations, their employees, or their expensive aeroplanes just because someone hasn't proved its unsafe. Fear of litigation could be part of it, but I give them credit by thinking that isn't their sole, or most important motivation. Ask BA, ask KL, ask any of the other reported 90 odd volcanic dust incidents over the last 20 years?
Better safe than sorry? You betcha.