Flying through volcanic ash clouds

[visibility3miles]

"We are seeking to limit our losses”.

This thread, albeit on JetBlast, could explain their concern:
http://www.pprune.org/jet-blast/4122...tla-blows.html

per ORAC:

Experts are warning that an eruption could be imminent at an even more powerful Icelandic volcano than the one that paralysed air traffic last year.

Seismologists are nervously watching rumblings beneath Katla which could spew an ash cloud dwarfing the 2010 eruption that cost airlines two billion dollars (£1.27 billion) and drove home how vulnerable modern society is to the whims of nature. Brooding over rugged moss-covered hills on Iceland's southern edge, Katla is a much bigger beast than the nearby Eyjafjallajokul volcano, which blasted ash all over Europe for several weeks in an eruption that local scientist Pall Einarsson describes nonetheless as "small".

BBC: New Icelandic volcano eruption could have global impact

Hundreds of metres under one of Iceland's largest glaciers there are signs of a looming volcanic eruption that could be one of the most powerful the country has seen in almost a century.

http://www.pprune.org/jet-blast/4122...a-blows-5.html

rp122 link (post #6) with a plot of the ash cloud in 2010 is interesting too.