Hey, from CNN. I'm Afoma DK with the five things you need to know for Tuesday, March 24th.

We're learning more about Sunday's deadly collision between an Air Canada plane and a fire truck at New York's LaGuardia Airport.

The collision killed the plane's pilot and co-pilot and injured dozens of people.

Here's CNN's Pete Monteen. There were only two controllers in the control tower here at LaGuardia at the time of the crash.

But we need to clarify something now. It's not that they were doing four positions.

They were doing something that was standard procedure, according to NTSB Chair Jennifer

Homondi. One controller and one supervisor, that supervisor was also doing the role of what's called

clearance delivery, meaning issuing route clearances, two flights that were still on the ground.

That other controller is known as the local controller responsible for airplanes still in the air,

taking off and landing and separation on the runway.

But what's not clear to investigators right now is which of those two people were performing

the duties of the ground controller, meaning responsible for all the movements of airplanes and vehicles

that were still on the ground.

Another major finding from the National Transportation Safety Board is that the airport's

ground radar system didn't warn air traffic controllers about the fire truck on the runway

because the fire truck was missing a transponder, which is technology that helps

air traffic controllers identify and track vehicles on the airfield.

More news coming up, including the latest escalation in a clash between Minnesota leaders

and the Trump administration.

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