Your explanation that "they need 5 minutes to secure the building" strikes me as a little odd.  
 
For conversation, the timeline: 
 
Card told GW Bush about the second plane at 9:05. At 9:15, Bush was in a holding room being briefed and considering remarks to the nation. At 9:35, the presidential motorcade left the school, half an hour after Bush had been told of the second plane while in the classroom. 
 
At 9:54, Air Force One lifted off. 
 
Cowperson
		 
		
		
		
		
		
		
			
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