Germany was criticized severely by the international press for lax security measures in Frankfurt Airport that allowed Demeke to smuggle a pistol on board , and for allowing the hijacked aircraft to leave after refueling in Hannover . Frankfurt Airport , the busiest airport in Europe at the time , had recently come under fire after the bombing of Pan Am Flight 103 over Lockerbie , Scotland in 1988 , when it had been alleged that the explosives had been loaded in Frankfurt . Since the 1988 bombing , the Frankfurt airport had performed numerous security reviews and implemented more stringent security procedures
Pan Am Flight 103
Pan Am Flight 103
Lufthansa Flight 592