Boeing's problems just multiplied.

From Marketplace, I'm Sabrie Beneshore, in for David Brancaccio.

Scrutiny of Boeing Plains has expanded beyond the 737 Max 9 after that Alaska Airlines flight

were part of the body. The plane blew off during flight. The Federal

Aviation Administration has told airlines to inspect some older models of 737's two

marketplaces Nova Safo is here with details.

Hi Nova.

Good morning, Sabrie.

So until now, Scrini of Boeing was focused on the new Max Nine model.

Now we're talking about planes that have been in the air for a while.

What's that mean?

Yeah, we're talking about the 737 900 ER. ER stands for extended range. United Alaska and Delta fly these

planes and it was first introduced almost 20 years ago and needless to say we have not

had a similar incident with these 900 ER model

planes as we saw with that Alaska Airlines Max 9 plane on January 5th and what's

come under scrutiny since are the door plugs that seal off unused emergency exits.

That's what blew off the Alaska Airlines plane.

The FAA put out a bulletin last night saying that older 900 ER model planes use an identical door plug design so they should be inspected as well.

Oh boy. So what does this mean in terms of more flight cancellations, disruptions for airlines?

Well, at the moment, we're not sure.

We're about to find out.

Initially, airlines are sending signals

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