Here we go again, another few days of massive disruption and cost to all.
This eruption could go on for a long time and with the Azores high soon to establish itself then the wind direction could be unfavorable for long periods.
I am aware that the ash levels permitted has been raised, but has any real research been done recently? IF it has then is it not possible for monitoring a/c be assigned to each airport, with the task to fly 20nm circles around the said airport. IF they were equiped with sensors then real ash levels could be detected.
At the moment the Met Office is providing forecasts based on computor models, just as they do for "proper weather". If these monitor a/c detected say a safe corridor to the SE of a particular a/p then at least we would not need these total shutdowns.