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After the September 11 attacks, there was an immediate call to action regarding the state of aviation security measures as the hijackers involved in 9/11 were able to successfully pass through security and take command of the plane. The existing security measures flagged more than half of the 19 hijackers in 9/11; however, they were cleared to board the plane because their bags were not found to contain any explosives.[1] In the months and years following September 11, 2001, security at many airports worldwide were reformed to deter similar terrorist plots.[2][3][1][4]