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Out of curiosity I was wondering which civilian passenger airplanes 
		
	
		
		
		
		
		
	
		 
		
	
	
	have the highest service ceilings? Wikipedia indicates that some business jets have ceilings greater than 53000 ft or so while the 747 has only 43000 ft. Also why do large aircraft fly much lower than their service ceilings? Usually I never see a large jet go beyond 37000 or so even on very long haul flights. I assume they would be even more efficient if they flew close to service ceilings on long haul flights.  | 
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