This documentary is an eye-opener for passengers and crew alike. Years of collected scientific data by renowned toxicology and medical experts show with easy to understand explanations, that there is clearly plenty of proof that the air circulating in aircraft is not as clean as one should be able to expect. Talk about jet-lag. Clearly not. Nervous system symptoms that people experience after inhaling toxic fumes can be clearly connected and compared to symptoms that are evident in types of chemical poisonings that directly affect the nervous system. I did some research and came up with "Aircrew Exposure to Chemicals in Aircraft: Symptoms of Irritation and Toxicity" and " The Toxicity of Commercial Jet Oils" by two highly recognized scientists, interviewed in the film, who have done a lot of work in to this subject. They say that materials used in the operation of aircraft may contain hazardous ingredients, some with significant toxicities . They found that some maintenance or operational activities, which are well described in the film can contaminate the aircraft cabin air. Occasionally, such exposures seem to be of a magnitude to induce symptoms of toxicity. I did some further investigation, and found that many of the other present, in the film mentioned fumes, are very toxic, even cancerous and are listed on the WHO ICD-10 list of illnesses caused by toxins. More really shocking reality is described in the film, but see for yourself. Everybody can do their own research after viewing and find that this documentary is well on the level of " highly educational and factual" with very good work done by the film maker. In my opinion a must–see film for everybody flying.