TAMPA, Fla. - U.S. Transportation Secretary Sean Duffy announced on Wednesday that 10% of flights will be canceled in the 40 busiest airports starting on Friday. This comes as the government shutdown continues to drag on more than a month later.

What we know:

Experts said it is a safety concern to have a standard volume of flights but a reduced number of air traffic controllers due to call-outs.

"That airport traffic is matched to the amount of controllers and the amount of runway space and various other factors," said Shawn Pruchnicki, an assistant professor at the Center for Aviation Studies at The Ohio State University. "So, if you have a decrease in, in this case, controllers, then you have to match that to the amount of air traffic coming in."

Air traffic controllers are not p

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