Jennifer Homendy

We've repeatedly recommended that ASDX transponder.

Well, in order for ASDX to work well, you have to know where ground vehicles and aircraft are.

So in this case, that vehicle did not have a transponder.

The NTSB highlighted several preliminary findings.

First, from the cockpit voice recording.

With an important point 40 seconds before the end, as investigator Doug Brazy said.

Truck one is told to stop four seconds before the recording ends.

NTSB Chairwoman Jennifer Homendy said they also know as far as controllers on duty at the time of the collision.

Homendy said they aimed to find all that went wrong, leading to the loss of two pilots' lives.

In New York, Grinnell Scott, Fox News.

In order for ASDX to work well, you have to know where ground vehicles and aircraft are.

So in this case, that vehicle did not have a transponder.

ASDX is a runway safety system which allows air traffic controllers to track surface movement of aircraft and vehicles.

So in this case, that vehicle did not have a transponder.

There were two people in the cab, two people in the tower cab.

We have the CVR and FDR.

We've also collected and have continued to collect surveillance video.

We've asked the Federal Aviation Administration, who will be providing that ASDE replay of the event, ASDE airport surface detection equipment replay of the event.

So it's been a really, really big challenge to get the entire team here and they're still arriving as I speak.

NTSB Chairwoman Jennifer Homendy said there are many questions that need to be answered at the start of this investigation.