https://www.bbc.co.uk/news/world-us-canada-49764305
Well - I can't speak for others, and this isn't something I often speak about - but, if I've been for a Number Two, I sometimes do need to flush twice to get it all down....The reason, the agent allegedly said, was that Mr Abdallah "went to the restroom and... flushed twice".
Perhaps "No.2"s are not permitted on aircraft?
Of course the racial stereotyping speaks volumes in this case. Otherwise, it'd be funny.
Yet another reason why I don't ever want to go flying again. Can I live up to this pledge?