One of the worst fires in the history of high rise buildings occurred on May 4 1988 in Los Angeles when the Aon Center caught fire. The building got filled with smoke. Forgotten in the pages of history is that the LAFD and LAPD sent helicopters to the top and sides of the building. A succession of attempts to rescue the trapped people was made despite the reported unbearable heat and smoke that reached to the top of the building. The rescue teams eventually succeeded in evacuating people by air. Helicopters landed and took off in succession, carrying survivors away. The LAFD sent four specialized fire helicopters. The LAPD also air landed on top of the building in the first minutes of the incident and rescued five people. 1988 FEMA report. pages 11-12 http://www.webcitation.org/query?ur...EMA-TecReport/FEMA-report.htm&date=2010-07-13 Now the obvious question comes... NYC, 13 years later. A city that has both the National Guard and the Coast Guard nearby... The NYC Coast Guard helicopters: New York National Guard it says on the lower left corner... The following pictures are from their facebook: https://www.facebook.com/media/set/?set=a.113489643973.120991.112535293973&type=3 More than all others, the Coast Guard is equipped to rescue people from ships on fire which are most of the time fuel fires. They have oxygen masks and tanks, just like the small unit that intervened in the Aon in 1988, 13 years before (FEMA report pg 12-13). Pictures taken from above the WTC towers by the news helicopters show no people on neither of the two rooftops, which supports the theory that the doors had been locked. Isn't it too obvious? Two rooftops, two attacks, no people on either of them. All instead crowding at the windows.