Sadly, William, I have to agree.  Frontier used to be the crown jewel airline for Denver and something about which to be really proud.   It used to be the most beloved.  What happened?  The answer comes in three letters SWA (Southwest Airlines).    Just as landing fees came back to earth as debt loads for building DIA began to be erased, guess who suddenly announced a return to Denver?  That's right.  SWA.  Too young to remember this important Denver Aviation History?  "May 26, 1983. Southwest inaugurates service from Denver (DEN) with six roundtrips per day. DEN closes on Sept. 30, 1986 and reopens in 2006" (source:  https://www.swamedia.com/pages/openings-closings). DIA construction:  Between 1989 and 1995,  When the landing fees went up to help pay for the new airport, SWA flew away, when they came back down, SWA swooped back in.  Their company was never affected but the landing fees which their competitors endured, and now  people prefer Southwest Airliens folk.