Terrorists are usually added to no-fly lists, yeah?
You really should be careful what you wish for because at this rate, you're probably going to get it and much more of it than you ever imagined.
Terrorism is an over-applied label that is used to stoke FUD and expand executive power; yep I agree with that and I don’t use the term lightly.
Joining an organized movement to overturn a legal democratic election, breaking into the capitol, armed, and bludgeoning an officer to death is terrorism and a private company has every right to deny these people the privilege of flying on their airlines.
Whether it could do with more oversight is an independent question, with no shortage of people to ask it.