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To germany to send ukraine some leopard two tanks. he warmed to the idea after antony blinken presented him to potential solutions to an issue that was exposing divisions within the u.s./european alliance. tell us more about these divisions and the plan from the secretary of state. >> so the division was really the germans suggesting that they weren't going to provide any of their leopard two tanks until the u.s. provided the abrams. the concern was, it was going to have a cascading effect on some other allies who have german-made tanks, that they wouldn't provide them. we've heard from weeks ...

21,000 flights delayed. 10,143 flights canceled. more than 1300. that backlogs the airlines. we know that they only have so much equipment, only 500, 600 planes each so when you're talking about 20,000 flights and 11,000, or 12,000 are affected, it's going to take a while before this thing gets back on track. >> that's correct. it's a cascading effect. as you know if you getting in in a plane on los angeles, he might have come from dallas-fort worth or newark, new jersey. he might've been the third stop. yet they have to get this repositioned and picked this schedule back up. it doesn't happen...

Pete buttigieg tweeted if he is on at that is comforting. i think the biggest story right now is what is going to happen today at the nation's airports. this is going to throttle the nation's airports for the day. when you have one delay, it is a cascading effect. we talk about that earlier. >> ainsley: look at this couple. thankfully they decided to fly down a day before the cruise leaves. hopefully they will get down there today. in these situations i bet you see rentacar soaring. people like them rent a car and just try to drive to florida. >> rental cars sold out during the holiday disaste...

To look into the cause of the initial problem. >> as of now, pete, 4,000 plus flights we're told delayed, it's been lifted. 700 cancellations. while it has been lifted, there's still major problems to contend with today as it comes to flying here in the united states. >> reporter: yeah, i'm just refreshing flight aware. 4,013 delays across the country and the airlines now have to play this game of catch up because there is this domino effect, this cascading effect, when so many flights are delayed, that means that so many things are out of order. we have seen it. think about the southwest issu...

Let's start with pete muntean. he's at reagan national airport. pete, a computer outage that absolutely no one needed right now. what is happening? >> reporter: no doubt, kate. the cascading effect is only beginning. 6100 at last check a flightaware of delays. cancellations just hit 1,000. the ntams, those are the bulletins that pilots need, added-on information about key information, whether a runway is open, whether or not taxiways are open, whether or not the navigational aids in bad weather are functioning. the ground delay programs are still in effect. american is delaying flights out