Frontier matched my DL Diamond status this year to their Diamond status. Cancelled a DL flight to take a $39 flight DEN ATL a couple weeks ago. Was pleasantly surprised. My wife and I had all Row 1 to ourselves (no one in middle seat) No extra fees as one of their Diamonds for anything. We brought some food to eat onboard and it was a fine flight that just so happened to be at a convenient time. I was expecting the worst, but it was fine. If they happen to have a nonstop at the right time, I would do it again. The savings is quite worth it on short flights, where DL tries to price gouge.