A new report finds August was a frustrating month for people flying in the U.S., with complaints about airline service jumping 14 percent compared to July.
The U.S. Department of Transportation said 2,250 complaints about airline service were filed in August, but it's not clear exactly what was bothering travelers.
One factor could have been a computer outage at Delta Air Lines in early August which lead to the cancellation of about 2,000 flights.
"It took us a long time to recover," Delta CEO Ed Bastian told CNBC. "The challenge we had at Delta is not just that we went out, it's that period of time we went out. It was early August, Monday morning, busiest travel time and we had no back-up capability."
Delta said it has corrected the lack of redundancy in its computer system that made the outage so costly.