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how long has it been since  airports have gone from 3-to-4 letter 
		
	
		
		
		
		
		
	
		 
		
	
	
	identifiers? also, when did ATC go from 2000 feet vertical separation above FL290 to 1000 feet? and, no, I was not doing time in prison for the past 20 years for trafficking.  | 
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