On Jul 17th 2015, a Spirit Airlines Airbus A319 from Chicago O'Hare began a descent into Boston, MA when fumes incapacitated
the flight crew. The first officer was able to don an oxygen mask and place one on the captain, who had slumped in his seat.
They managed to land the aircraft but could not recall later how they had managed the feat. Fifty days later, the captain
was dead. Now, airline industry observer Simon Hradecky at The Aviation Herald has pieced together compelling evidence that
toxic fume events involving Tricresyl phosphate (a neurotoxic oil additive that combats metal wear in bearings and gears of
turbofan engines) in internal cabin breathing air are taking a heavy health toll on passengers and especially on flight crew
and attendants. His research leads him to conclude that not only are almost all airliners susceptible to these "bleed air"
fume incidents, but that authorities seem to be covering up the problem, with only 6 events being reported in a year despite
almost 2,000 having actually occurred.
http://avherald.com/h?article=4b6eb830&opt=0
http://avherald.com/files/post_mortem_study_abou_donia_goot_mulder.pdf
https://en.wikipedia.org/wiki/Tricresyl_phosphate