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The Trump administration tells federal agencies to prepare for permanent mass firings if the government shuts down.

Plus, we look at how Delta Airlines is racing to address a surge of toxic fume events happening on planes.

The Airbus A320, which is the best-selling aircraft in the world today, is kind of driving this increase in incidents that we measured in our reporting.

And that's really the plane that Delta is trying to deal with,

trying to curb some of these fume events.

And senators question big tech companies over how they use H-1B visas.

It's Thursday, September 25th.

I'm Caitlin McCabe for the Wall Street Journal,

and here is the AM edition of What's News, the top headlines and business stories moving your world today.

We begin with Breaking News from Denmark, which has suffered a professional hybrid drone attack overnight.

Drones were observed over multiple airports late Wednesday, including a military airbase housing most of the country's F-16 and F-35 fighter jets.

It's the second time in less than a week that unmanned aircraft have disrupted air traffic

in the NATO country and follows Russian violations

of Estonian and Polish airspace in recent weeks. The Danish Minister of Defense said a professional

actor was behind the attack and that the drones were launched from Denmark's vicinity. He added that

there was currently no evidence linking the drone activity to Russia, but called

the action a danger to freedom and safety. The Danish government is now considering calling for

national security consultations under NATO's Article 4. U.S. lawmakers have less than a week to reach

a spending agreement before the government shuts down.

And the situation just got all the more complicated.

...