Bobcats Over Washington on 9/11: What Were Two Mystery Aircraft Doing Overhead at the Time of the Pentagon Attack?
Two military aircraft were flying at high altitude near the Pentagon around the time it was hit on 9/11, but the identities of these aircraft and what they were doing over the Pentagon are unknown.
The planes had the call signs "Bobcat 14" and "Bobcat 17." A partial transcript of air traffic controller communications reveals they were communicating with the control tower at Washington's Reagan National Airport, which is less than a mile from the Pentagon, between at least 9:31 a.m. and 9:40 a.m. on September 11.  (The attack on the Pentagon took place at 9:37 a.m. ) Radar data has shown that the two aircraft flew "in trail" (in single file, with one directly behind the other) at an altitude of 21,000 feet, and were overhead in the few minutes before the Pentagon was hit.