It is now evident that each hijacking situation needs to be evaluated on a case-by-case basis . Cabin crew , now aware of the severe consequences , have a greater responsibility for maintaining control of their aircraft . Most airlines also give crew members training in self-defense tactics . Ever since the 1970s , crew are taught to be vigilant for suspicious behaviour . For example , passengers who have no carry-on luggage , or are standing next to the cockpit door with fidgety movements . There have been various incidents when crew and passengers intervened to prevent attacks : on December 22 2001 , Richard Reid attempted to ignite explosives on American Airlines Flight 63 . In 2009 , on Northwest Flight 253 , Umar Farouk Abdulmutallab attempted to detonate explosives sewn into his underwear . In 2012 , the attempted hijacking of Tianjin Airlines Flight 7554 was stopped when cabin crew placed a trolley in-front of the cockpit door and asked passengers for help
Tianjin Airlines Flight 7554
Tianjin Airlines Flight 7554
Aircraft hijacking