UGH: ‘Largest Operational Meltdown in Southwest Airlines History’ Continues Despite Weather Clearing. “That’s not the worst of it. By 11 p.m. ET on Monday night, the carrier had already canceled more than 2,400 flights for Tuesday and over 2,300 for Wednesday. Flight rebooking for stranded passengers will not be available until Friday, according to CNN. And the airline announced new bookings won’t be available until January 3.”