During the same period that American Airlines struggled through a labor dispute with its pilots, the carrier's on-time performance dropped to 58% in September.
The nation's largest airlines arrived within 15 minutes of their scheduled time an average of 83% of the time, according to the latest numbers from the U.S. Department of Transportation. That's an improvement over the 79% on-time performance in August.
Fort Worth-based American Airlines had the worst on-time performance of all major airlines in September, according to the data released Thursday. The best on-time rate, 96%, was reported by Hawaiian Airlines.
The poor performance by American Airlines was no surprise considering that the airline canceled hundreds of flights and delayed others in September because of an increased number of calls for maintenance work filed by flight crews and a surge in pilots calling in sick, according to the airline.