It now seems that Lufthansa,KLM,and possibly others,are getting impatient,launching their own exploratory test-flights, and claiming that no real threat to airliner safety exists ! Whereas the recent British sampling-flight has detected,albeit in small quantities,different types of identifiable volcanic detritus at various altitudes, and warned against flying through / into it.
    An over -reaction by the "Health & Safety Nutters" may well have ensued, but I for one wouldn't risk it ; would YOU ?? But I guess someone will, and there may yet be tears....