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 The Dallas carrier acknowledge inadequate and outdated operations technology that can leave flight crews out of position when adverse weather strikes.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