https://www.siliconvalley.com/2022/01/24/self-upgrading-passengers-force-another-flight-to-turn-around/ > For the second day in a row, a U.S. jetliner turned around an hour into a flight because of passenger misbehavior. > Thursday night’s incident on a United Airlines flight was not COVID-related: Two men had decided to “self-upgrade” and would not leave business class.