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[Most airlines, like Qantas, have a residual spray pumped throgh the plane once every three months and this coats every surface in the aircraft. So when you board, you are sitting in the pesticide for the entire journey.
This is different than spraying the cabin crew area every flight and having them breathe it daily, hence why they do it this way.
As where I got the information, I work in the pesticide research industry and am involved with the research on top of descent for reptiles and for it's impacts on people (safe application strategies).
If you do a google search you will see these are the same reccomendations that the USA researchers have suggested for their airline industry. Many workers have suffered from ill effects of continual use of synthetic pyrethroids such as pemerthrin.
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