Due to regulatory delays, Delta Air Lines is temporarily changing plans for several A321neo jets — with a massive expansion of first-class seating.

Flying first class once meant showers of Champagne and cold caviar. Now, it's a Shake Shack burger, hold the fries. Iain Bagwell/Delta Digging into fast food faves is now an unexpected first-class ...

Delta's got more firepower underlying its earnings generation and is more reasonably priced than United.