This study suggests an integrated framework to quantify cyber attack impacts on the U.S. airport security system. A cyber attack by terrorists on the U.S. involves complex strategic behavior by the terrorists because they could plan to invade an airport electronic system without any U.S. border or entry point. At the same time, any defending entity must consider the complex processes that may cause turmoil. The possibility of simultaneous threats from cyber attacks causes another difficulty for defending entities to secure their airports.