What does surprises me is that so far, by following the thread, the possibility of incapacitation due to toxic fumes on the flight deck hasn't been considered or discussed.
I am -only- cabin crew, but as such flying the skies for two decades, so I do have some insight.
Fact is this:
http://avherald.com/h?article=434e753b/0019
was an A319 though, but nevertheless a very serious incident!