According to aviation analyst Henry Harteveldt, the airline's contract of carriage favors the company, not the passenger. Involuntary denial of boarding is not uncommon but removal after boarding because the seat is needed by others is "exceedingly rare".
Aviation expert Henry Harteveldt states that the airline's contract of carriage benefits the airline more than the passenger. While involuntary denial of boarding is common, being removed from a plane after boarding due to needing the seat for someone else is extremely uncommon.