Thousands of passengers had planned their travel on Friday after airlines canceled nearly 1,400 US flights after a typhoon hit the East Coast.
According to tracking service FlightAware, another 6,300 flights were delayed till evening.
It was the second straight day of major disruptions and the worst day of cancellations since mid-June.
The three major airports in the New York City area and Reagan National Airport outside Washington, DC recorded the most cancellations.
American Airlines scrubbed about 250 flights, or 7% of its schedule. Republic Airways, which operates smaller aircraft for American Eagle, Delta Connection and United Express, canceled about 25% of its flights for the same number of flights.
According to the Federal Aviation Administration, thunderstorms were halting or delaying evening flights in the New York, Boston, Washington, DC, area, Philadelphia, Baltimore and Denver areas.
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About 1,200 US flights were canceled on Thursday, accounting for 4.6% of all scheduled.
Passengers have faced widespread cancellations and delays this summer. Travel in July bounced back from pre-pandemic levels—about 88% faster than expected—and airlines weren’t able to grow the workforce fast enough. They are cutting schedules in an effort to make the remaining flights more reliable.
Airlines flying into the US had a poor June, accounting for more than 21,000 flights, or 2.7%, up from 1.8% in June 2019, before airlines pushed workers to leave during the pandemic. Airlines outperformed in July, however, canceling about 14,000 flights, or 1.8%.
Delays have been more frequent – more than 23% in both June and July.