It's an MX missile base?
MX is an abbreviation for maintenance, I thought it was more common outside of aviation that I wouldn't need to explain it. I guess I was wrong.
United also uses Denver's newer airport as a hub, but then the idea of a hub is rather fluid.
Just flew through it last week. It isn't the worst airport that I've been through for international, they at least had moving sidewalk for the six mile walk to customs.