In this closed off part of class b airspace indicated by the blue solid lines we see a fraction that says 110 40 meaning that this part of class b controlled airspace doesn t start until 4 000 ft. The faa is amending title 14 of the code of federal regulations 14 cfr part 71 to modify the dallas fort worth tx class b airspace area. Class b airspace areas are designed to improve aviation safety by reducing the risk of midair collisions in the airspace surrounding airports with high density air traffic operations. 
				
			
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