Song was like flying on a different airline. The seats were new, the inflight video entertainment was state of the art, and the stews' attitudes were ripped right out of Southwest's playbook.
In short, Song was a superior product to mainline Delta. You Legacy CEO's just don't get it. While focusing in on costs, you neglect to make a product/service mix equal to a Frontier or your own low cost tryout like Song.
Now, what are the odds that Delta will revamp their entire fleet with the successes of Song, including "attitude"? They can blame costs all they want, but it will be to the passengers' demise.