Doing some quick reserach, some potential explainations for the size of the airport and the extra long runways are that Denver is a major national and international hub, due to it's centralized location and is the base for a number of airlines. Also, any pilot knows that the higher the airport the longer the runway needed, due to reduced power in the thinner air, so that could explain it's super long runways.

As for as the conspiracy theories, I have no idea. Some sound interesting.....


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