It is less likely if only because the flight regulations aren't as strict--it used to be any measurable ash closed an air space, but this has now been revised t

It is less likely if only because the flight regulations aren't as strict--it used to be any measurable ash closed an air space, but this has now been revised to close airspace only if the ash levels are 4mg per cubic meter of air or greater. http://www.iata.org/pressroom/facts_figures/fact_sheets/pages/volcanic-ash.aspx http://www.iata.org/pressroom/facts_figures/fact_sheets/page... http://www.icao.int/publications/documents/9974_en.pdf http://www.icao.int/publications/documents/9974_en.pdf