Arbitrary power can achieve a lot of good things but it always ends the same way. So better WiFi on the plane but one day you find you can't get on a plane anymore because you said the wrong thing.
Isn't that already how it works? At least for specific values of "the wrong thing" - one day you find you can't get on a plane because you said "I want to blow up this plane."
But also "I am going to Colombia to bring some cocaine home." and "I am going to Washington to assassinate the president." and "The right of the people to keep and bear nuclear bombs shall not be infringed." and any number of other things that don't immediately threaten the plane's integrity.
Bans from planes are already arbitrary and capricious, so I don’t think changing which arbitrary power is responsible really makes a difference here. Look at all the news articles of people ending up on the no fly list for garbage grounds.
But also "I am going to Colombia to bring some cocaine home." and "I am going to Washington to assassinate the president." and "The right of the people to keep and bear nuclear bombs shall not be infringed." and any number of other things that don't immediately threaten the plane's integrity.