A JetBlue passenger opened the plane's emergency exit after reportedly arguing with his girlfriend

A JetBlue Airbus A320.

Nicolas Economou/NurPhoto via Getty Images

• A JetBlue passenger opened an emergency exit on a taxiway in Boston, the FAA said.
• One witness said that the man was arguing with his girlfriend before the incident.
• A pilot told air traffic control that the passenger was subdued by an officer on board.

A JetBlue passenger delayed his fellow travelers after opening one of the plane's emergency exit doors.

The incident occurred while Flight...