Silverstrata and dozens of others:
And most aircraft on long-ish haul will only spend max one hour in the affected region/level per flight. That's not a long time, and you can boroscope after each rotation to make sure.
Its not rocket science, you just need to realise that the world is not a risk-free place - and aviation is not a risk-free industry. But the modern politician/civil servant is so frightened of his/her own shadow, they can no longer make rational decisions.
Of course you aren't a shareholder in an airline are you?
It's not going to be you who pick up a Forty million dollar bill when your "boroscope" investigation reveals that the hot sections of all four of your engines are irreparably damaged and require replacement is it?
Don't you think you are being just a little selfish asking an airline to risk a hundred million dollars worth of engines just so you can get your Two weeks in Benidorm or some other hole?
Eagleflyer:
What would have been done twenty years ago without all that calculating power of modern computers and thus no athmospheric models like the ones we have now?
You would have avoided any visible ash cloud...and thatīs it!
Common sense really has to return quickly or else...
But itīs retreating everywhere unfortunately!
What would have been done? That's easy to answer:
Your airline engineers would have been making lots of overtime money replacing many more engines than usual, and wondering why they hadn't reached their expected service life, that's what would have been done!
Common sense indeed!