Simply put there is way too much competition on this route for DL to step in. It's a hub-to-hub route for UA, and a hub-to-major-market route for AA. There is a ton of capacity already.
Originally Posted by
davie355
Yet DL has Sky Clubs in both airports.
Yet, that isn't remotely relevant.
Delta isn't flying DEN-BNA, FLL-PHL, MKE-MSY, or MCO-DFW anytime soon either.