“It was out earlier this morning, and it should be back very quickly,” Martin said of the Aerodata system.

Southwest said that it had an “internal ground stop” for about 40 minutes and that “scattered flight delays are anticipated.” It advised customers to check its website for updates.

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Delta said in a statement that some of its connecting flights were affected. “No cancellations are expected due to the issue and our teams are working to resolve some resulting delays,” it said.

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JetBlue said it, too, had delays on some of its flights because of the Aerodata problem.

United said that about 150 of its flights were affected. “Some flights that were affected have departed, and we’re working to get all affected flights back on schedule,” United said in a statement.

Just after 8 a.m., FlightAware.com said about 100 flights were late or canceled at Baltimore-Washington International, Dulles International and Reagan National airports.

Travelers should check with their airlines about the status of their flights.