Does 'The most recent hijacking that involved U.S. air traffic controllers, FAA management, and military coordination had occurred in 1993.' provide a contradiction to the established premise 'The most recent hijacking that involved three air-traffic related organizations had been they year before that.'
The most recent hijacking that involved U.S. air traffic controllers, FAA management, and military coordination had occurred in 1993.###The most recent hijacking that involved three air-traffic related organizations had been they year before that.