qatar, to manchester, the fighter jet scrambled to escort the plane in. once on the ground, armed police swooped in, arresting the passenger who passed the note. >> it was terrifying. just terrifying all the way through. you just never think you'd be in that sort of situation really. >> reporter: airlines around the world are on edge. we saw it in canada, just two weeks ago. a s.w.a.t. team storming a flight after a threat was made. in great britain, passengers once again shaken up. fortunately, no suspicious device was found on board the plane. and the passenger who made the bomb threat is still in police custody and being questioned. lama hasan, abc news, heathrow airport. >> they arrested that man. and can you believe that just last year alone there were some nearly 20 flights that were scrambled. they send in these royal air force fighter jets. 17 times in 2013.