There are plenty of Karen's not just among the passengers but also among airline staff.

This sounds like "more power to corporations!". It should be decided by a court on an individual basis not by a chuckle-duck CEO based on staff complaints.

It's easy to move from this to "let's share lists across airlines." And followed by "hire people only if they're not on the list?" All because a flight attendant had a bad day.

Not apologizing for anti-maskers or other ill-behavior. But the way to solve this is in the courts not by privatizing justice.