> Someone who the US deems a danger but isn't in the US would fit this criteria.
If the bad person isn't in the US there's no need for US airlines to maintain a list of them which prevents them from getting on a plane, but then just sends them on their way to arrange other travel plans. What we want for really bad people outside of the US who should be arrested on sight at airports are warrants. Signed by judges. Not secret lists with no oversight or transparency, and not sending dangerous people back out into the American population.
If the bad person isn't in the US there's no need for US airlines to maintain a list of them which prevents them from getting on a plane, but then just sends them on their way to arrange other travel plans. What we want for really bad people outside of the US who should be arrested on sight at airports are warrants. Signed by judges. Not secret lists with no oversight or transparency, and not sending dangerous people back out into the American population.