EU moves to ease Europe flight curbs
Video at the link....
And:
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According to current European regulations, no matter how low the concentration of ash, no commercial aircraft should fly as long as it is in their path.
A spokesperson from from Nats told BBC News that there was "no threshold" for concentrations at which volcanic ash was acceptable.
The dust is simply too dangerous for jet engines to risk commercial flights encountering it, said Nats. If volcanic ash particles are ingested into a jet engine, they accumulate and clog it with molten glass, which can cause the engine to shut down.
I don't have the scientific or engineering background to understand the physical damage such atmospheric condition may (or may not) cause a jet engine. But, I certainly understand economics. And, even if it's dangerous - perhaps even dangerous enough to cause a catastrophic engine(s) failure - that economic uncertainty is FAR outweighed by the economic reality of the ban.
Simply put, those airlines could probably lose a jet a week, and still be ahead (financially) where they are with the ban in place. Given that economic and financial reality, I'm not sure I'd place too much faith in what the airlines say.