What? I can book ATL <-> WAS round trip for $74 with Frontier, $184 with Delta. With a checked bag $168-254.

<shrug> it's what my look up specifically for this comment gave me using Delta's website. I tried booking for 3/30 - 4/02 roundtrip. I went with Delta as that was specifically called out in TFA. Deliberately limiting the variables. Besides, I'd be in a really desperate situation to choose Frontier.