Another gem for DAL:
Airlines Rank Worst of 47 Industries With U.S. Fliers ?Vastly? Unsatisfied - Bloomberg

Lowest Score
The lowest score among major carriers was a 56 for Delta Air Lines Inc. (DAL), the world’s second-largest by traffic. The only worse result among more than 225 companies covered in the index was a 54 for energy delivery company Pepco Holdings Inc. (POM)