DALLAS (AP) — Southwest Airlines is still trying to extract itself from sustained scheduling chaos and cancelled another 2,350 flights after a winter storm overwhelmed its operations days ago.

The Dallas carrier acknowledge inadequate and outdated operations technology that can leave flight crews out of position when adverse weather strikes.

There was a total of 2,450 flights cancelled in the U.S. early Thursday, 2,360 were Southwest routes, or about 58% of its entire schedule.

Southwest was the only airline unable to recover from storm-related delays that began over the weekend when snow, ice and high winds raked portions of the country.

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