I found it Friday morning on DL's site as an "A" class fare in First. It was actually 50 cents cheaper than the Economy fare for the same flights. $387.20 RT. Something about it seems a bit too good to be true which is why I posted the fare basis. I checked the same flights Friday night and the "A" fare was over $1400 RT and the cheapest Economy "L" was over $600 RT.
Why on earth would DL be selling First for less than Economy? Might it have something to do with the effects of the hurricane?