Tweet posted to United's Twitter account noticed by employee in corporate security at 7:05 p.m. Wednesday night, 30 minutess before the flight was scheduled to depart
All 49 passengers aboard the Bombardier CRJ200 regional jet were evacuated as crews search the plane for explosives. None were found.
The passengers were also all searched again and their baggage rescreened.
The plane finally left the gate at 9:19 p.m. and arrived at the Washington, D.C.-area airport at 10:31 p.m., one hour and 38 minutes late.