cabin air
without going too tech here mobil jet 2 when burnt shows phosphoresce in the dark ...years ago when ANSETT was a major carrier in AUSSIE [we wont go there]their 146's were used as cargo on the red eye and they were very oily smell on their return so a black light was used to show what was on the inside and the whole cabin was illuminated ...ie covered in a oil mist,this is what people are breathing in.... the investeragition must go on....i know that several samples were taken on different carries and different a/c type then sent to the US as part of this invest. all showed positive for oil presence......hope we will get some answers at some stage as people are dying of something and it could very well be this...??????