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At La Guardia Airport in New York on Friday, Divneet Wadhwa, 26, was stewing. Her flight to Toronto, where she was going for a wedding, had been delayed three times.

“I don’t think we’re going anywhere,’’ Ms. Wadhwa said, adding that she had events later and that being stuck in New York would “really mess everything up.”

She was just one of thousands of travelers across the Northeastern United States whose plans were upended Friday morning after a shortage of air traffic controllers triggered significant flight delays.

A few hours later, President Trump announced a deal to temporarily reopen the government, easing the increasing strain on federal agencies, for a few weeks at least.