Of course the problem the authorities have now is how to backtrack without losing face when it becomes clear that the air travel situation cannot continue and some degree of normality must be resumed.
I still believe they over reacted, of course we cant fly through volcanic ash, as professional pilots we all know this and dont need it explaining to us.
Its not going to be up to pilots whether they fly through this - its an engineering decision and you obviously don't know or care about the the issue.
This is the damage to the engine a short flight in a f-18 Hornet incurred.
Hornetien moottorit tuhkassa - katso ilmavoimien kuvat | Uutiset | Iltalehti.fi
Airlines are not going to put their aircraft up in that no matter what.