It may not be "just" planes flying into buildings.
http://www.stevequayle.com/ New York City;
Los Angeles; Washington, DC.; Chicago
Stolen cargo planes loaded with WMD. Concern for radio controlled, large model aircraft containing biologicals. Additionally, female suicide bombers in cities previously noted, targeting large gatherings like sports events, malls, etc.
COMMENT: DoD sources have indicated FOUR 5-man teams in possession of cargo aircraft headed for previously noted targets: the White House, the Pentagon and speculation of the NY Stock Exchange. Additionally, US counter-terrorism units are specifically concerned with radio-controlled model aircraft being used as a platform to disperse biologicals over target cities. Several U.S. military gunships were spotted chasing RC aircraft on Dec. 20. In the last 48 hours, actual photographs of suitcase nukes have shown up on "disappearing" Jihad websites. Developing. . .
Or remote controlled planes being used as diversion from the "real thing".