DOT reported Tuesday that Hawaiian Airlines once again had the best on-time performance, while Comair - a subsidiary of Delta Air Lines Inc. - had the worst.
The most frequent causes for flight delays included airport congestion, equipment problems and weather.
The airlines report the causes of delays in broad categories - such as "Extreme Weather" and "National Aviation System Delay" - that were created by the airlines, industry groups, travel agents and government officials.
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