Delta raised their one-way, walk-up fares caps from $499 to $599 for coach, and up to $699 for first class. They attributed the fare increase to higher than expected fuel costs. As the reader who sent this piece in asked:
What kind of fuel costs were they expecting? When they announced simplifares, Goldman was talking about $100/bbl crude.
Tellingly, Delta shares went up over 10% on the news.