A pyrotechnic explosion to help simulate a real disaster debris field is seen during the full-scale, LAX Air Exercise aircraft disaster simulation training drill at Los Angeles International Airport (LAX), in Los Angeles, California April 24, 2013. The LAX AirEx is a two-hour long simulated aircraft disaster with over 100 volunteers in moulage, role-playing as accident victims and is designed to test LAX's Emergency Response Plan, as required by the Federal Aviation Administration (FAA) at least once every three years to evaluate the operational capability and readiness of LAX's emergency management system, according to Los Angeles World Airports. [Photo/Agencies]