In the middle of peak holiday travel, Southwest Airlines cancels nearly two-thirds of its flights.

Why did the nation's largest air carrier strand hundreds of thousands of customers?

Amir Martinez, that's Leyla Faddle, and this is up first from NPR News.

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Hundreds of thousands of passengers all over the country have seen their flights on Southwest

delayed or canceled and the airline is still canceling flights right at the peak of the busy

holiday season. Tuesday night, Southwest CEO Bob Jordan issued a video pleading with frustrated

travelers and frustrated Southwest employees for patients. We're doing everything we can to return

to a normal operation. And please also hear that I'm truly sorry. Kyle Arnold covers aviation

for the Dallas Morning News and he's been following the story. Good morning, Kyle. Thanks for having me.

So Kyle, how many flights has Southwest canceled at this point?

Up to this point, it's a bit more than 13,000 and now it's looking at about 2500 a day,

you know, and definitely until they can get this figured out. So what is happening? What is Southwest

saying caused all this? Well, there was a weather issue late last week if you remember, they really

swept through some of the big key airports in Chicago in Denver. But we've seen this at airport

with airlines, you know, over the last year and a half is that when they have these events, they kind

of have this this crew meltdown where they can't get their planes and pilots and flight attendants

...