Reported from Reuters that a total of 1,019 flights were canceled as of 6:00 pm ET, according to flight-tracking service FlightAware.
Low-cost carrier Southwest earlier this month faced US government backlash for canceling 16,700 flights over the holidays as it grappled with bad weather and outdated technology.
The company has scrapped about 12% of its Monday schedule, while American Airlines Group Inc (AAL.O) has canceled 6%, or 200 flights.
The fresh cancellations come as the US aviation sector recovers from a nationwide ground stop imposed by the Federal Aviation Administration (FAA) over a computer issue.
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