By . Jonathan Block . United Flight 5714 was schedule to leave JFK at 7:35 p.m. and passengers had already begun boarding the plane when the tweet was spotted at 7:05 p.m. A United Airlines jet (same model pictured) was delayed out of New York's JFK Airport on Wednesday evening after a bomb threat was posted on Twitter . The jet finally arrived at Washington Dulles International Airport (pictured) more than an hour and a half late . 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.
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 JFK Airport . All 49 passenger evacuated from plane and searched again while luggage was rescreened . Plane landed at Washington Dulles International Airport more than an hour and a half late .