As Southwest flight cancellations continue, Buttigieg vows to hold airline accountable

(CNN) — Relief is still a few days away for passengers booked with Southwest Airlines this week, as the beleaguered airline continues to grapple with what US Transportation Secretary Pete Buttigieg has referred to as a complete meltdown of the system.

Out of the 2,753 cancellations already made for Wednesday flights within, into or out of the United States as of 8 a.m. ET, 2,507 of them are operated by Southwest, according to flight tracking website FlightAware.

In all, Southwest has canceled more than 15,700 flights since winter weather began disrupting air travel on December 22. That figure includes more than 2,300 flights already canceled for Thursday. Other US airlines have since recovered from the storm disruptions.

Buttigieg says he spoke directly to Southwest CEO Bob Jordan on Tuesday about the thousands of flights that have been canceled this week with no immediate indication of when passengers can rebook.

"Their system really has completely melted down," Buttigieg told CNN's Wolf Blitzer on Tuesday.

"I made clear that our department will be holding them accountable for their responsibilities to customers, both to get them through this situation and to make sure that this can't happen again."

More than 3,200 flights within, into or out of the United States were canceled on Tuesday, according to FlightAware. Of those canceled flights, some 2,694 were those of Southwest -- a stunning 84% of all canceled flights in the United States.