In an amazing overstatement of the incredibly obvious, Alaska Airlines
spokeswoman Mariann Lindsey has stated:

"The state of Alaska has many active volcanoes, we try to avoid them
because they affect airplane engines"

Yes, folks, large pieces of rock firmly (and not so firmly) attached
to earth are considered a bad thing for an airplane engine.

No word was given on how passengers or the rest of the aircraft are
affected by volcanoes.

http://www.forbes.com/markets/2008/0...markets22.html

or

http://preview.tinyurl.com/6gp4zy