Comment by reisse

This is somewhat false? There were four other bombings, two in western countries (specifically EU->US flights). None of these two were successful in terms of "the plane was downed", but bombs were carried on a plane and exploded, and security didn't stop that.

22 December 2001, American Airlines Flight 63 7 May 2002, China Northern Flight 6136 25 December 2009, Northwest Airlines Flight 253 2 February 2016, Daallo Airlines Flight 159