He had tickets for one flight, then switched them to an earlier flight, which they were able to accommodate by giving him standby. After they filled the plane there was only one seat left, but according to their policy he would have needed two.
Gotta love the news. Why bother reporting on what happened when we can make old people talk about twitter?
As he was being ejected, he said he locked eyes with another guy farther back who was bigger than he was and who had a terrified look that he was next. But he wasn't.