I hope the Dutch pilots association did not really say this. One empty 737 which did a flight and survived is not proof.
Our met offices probably have a good idea where the ash is and AMS is not far from the node. The issue is whether the ash density and makeup could affect safe flight at certain altitudes and, if so, which? Without this knowledge I would question how anyone can claim safe dispatch.
First of all it wasn't empty, the CEO was on board, also head of flight ops.
Second, it's not just one flight, KLM is in the proces of flying ten aircraft from Germany back to Holland.
What do you propose to solve this mess we're in? We have got to go forward some way otherwhise it will be game over pretty soon.