Denver's airport was built with ATL scale in mind. It's already the largest airport in the US by land size, nearly twice as large as the next airport on the li

Denver's airport was built with ATL scale in mind. It's already the largest airport in the US by land size, nearly twice as large as the next airport on the list, which gives them tons of room to expand without needing to buy up neighboring plots. The airport already has six runways and the master plan calls for six more. Two of the three existing concourses can be lengthened to add more gates and the plan allows for four more concourses without needing to reconfigure runways. Last year the city approved a plan for 39 new gates. (In case you've ever wondered why taxiing at DEN takes forever, this is why)