As for DEN-PSP, United's pricing appears to be "we're the only ones offering nonstop service on this route" pricing. Then again, sub-daily on an E90 has a different market penetration style vs. 2x dialy on a CRJ.

Right now everyone else is one-stop DEN-PSP, and everyone is more expensive.

On DEN-LIT, F9 is the only cheap airline. One or two stop flights are significantly more expensive. Nonstops are over $400 one way, courtesy of a mix of United ERJs and CR7s (3x daily though).

The question is whether leisure and connecting traffic can fill an E90 once daily. Then again, there may be enough of a "Frontier Effect" (WN serves neither of these locations direct, and doesn't serve PSP at all) to keep a relatively small plane reasonably (say 80 pax/flt), where a mainline jet from someone else wouldn't work.