(CNN)By now, the video of a United passenger being dragged off a flight at Chicago's O'Hare airport has made it around the world and undoubtedly inundated your news feeds. There are a million things to unpack about the incident: The appropriate use of force, the rights of passengers, the PR fallout and ultimately the state of air travel that allowed for such a thing to happen.

1. Why this man?

2. Who is he?

3. Can an airline legally kick a paying customer off a flight?

4. Why didn't they just offer the man more money?

5. What can you do if it happens to you?