A United Airlines gate agent was punched unconscious by a Maryland passenger during boarding at Washington Dulles International Airport late last week, prompting the passenger’s arrest.

An irate United Airlines passenger knocked out a gate attendant at Washington DC-area airport, hospitalizing the employee and earning himself a one-way ticket to the airline’s blacklist.

Christopher Stuart Crittenden, 54, has been banned from flying United Airlines after he allegedly punched a gate agent on Thursday, March 13, in a video that has since gone viral. Crittenden was arrested and charged with assault and disorderly conduct.