This really is a safety issue just as much as a medical issue, so it is very relevant that this threat appears in this mainstream forum rather than tucked away in the Medical Forum.
Many obviously regard this as potentially a very serious problem, and the very eminent ‘New Scientist’ magazine have also addressed the issue this month with an article entitled ‘Toxic fumes impairing our ability to fly, says pilots’, see
http://www.newscientist.com/article/...ay-pilots.html