Originally Posted by
highpeaklad
Same from CAI and African destinations. I think it is a UK govt requirement. It's to kill any insects which might be carrying disease so it would be pointless to do it after cleaning, it has to be done after the doors are closed. Perfectly safe.
It may very well be a UK gov requirement(link available?) but BA at least is claiming that they're mandated to do so by the WHO(does the WHO even have legal competency to require this?).
Regardless, I've never experienced it in travel to a first-world destination. The only time that's happened is when Air France fumigated the cabin in Lome, that was disgusting.