Exactly. Altitude and playing at home for them, 19-1 in September. Enough said
The air might have played a factor, but it wasn't a 25-point factor. The biggest reason Dallas got beat like that had nothing to do with the altitude. Denver simply played the best game they've played in years. They had a great game plan, and executed it to near-perfection. As another poster put it, Denver played over their heads. Dallas meanwhile, played well below their capabilities.
THAT'S what beat Dallas last week.