A man was violently removed from a United Airlines [part of United Continental] flight by aviation policeofficials at Chicago’s O’Hare international airport on Sunday, in an incident captured on video by several other passengers. In one clip, posted by passenger Audra Bridges to Facebook, guards can be seen aggressively grabbing, and then dragging, the passenger down the aisle of the plane, which was bound for Louisville, Kentucky... United said airline representatives chose four passengers to leave the plane at random based on ticket class, frequent flier status and check-in time, and that one man selected refused to leave his seat... The Chicago aviation department said later that one of the officers did not follow protocol... The man rushed back on to the plane, past security and airline officials after being dragged off, his face bloodied and looking confused... 

“This is an upsetting event to all of us here at United,” airline CEO Oscar Munoz said... “I apologize for having to re-accommodate these customers..." In a statement the Chicago police department said that the man became “irate” after he was asked to disembark and that he “fell” when aviation officers “attempted to carry the individual off the flight... His head subsequently struck an armrest causing injuries to his face.”  The airlines contract of carriage, an agreement that all customers assent to when booking, does give United the freedom to deny ticketed passengers travel if a flight is overbooked.