We in Europe would be interested to know the procedures in place, as Europe is trying to implement an “operators’ discretion” system.
What’s happening down there is a very specific situation – normally the job of charting the ash contamination should be the responsibility of the VAAC in whose region the eruption occurred (Buenos Aires). But trans-Tasman flights transit between two other VAAC regions (Darwin and Wellington). An earlier poster said that Darwin was providing advice to the Aus carriers. Could there be three – or more – ash dispersal models circulating, all showing different results?