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U.S. airlines in June turned in their worst on-time performance since December, the Department of Transportation said.
The airlines had a combined on-time arrival rate of 76.1 percent, compared with 80.5 percent in May. But the carriers had fewer delayed flights this June than in the same month a year ago. The on-time rate in December was 65.3 percent.
The most frequent reasons for flight delays included airport congestion, equipment problems and weather. June was a bad month for severe weather across the nation.
The National Weather Service recorded more than 6,400 incidents involving hail and high winds, almost twice the number reported in May.
A flight is considered on time if it arrives within 15 minutes of the scheduled arrival time.
