(CNN) — Millions of Americans expecting to fly this month could have their plans grounded weeks ahead of the holiday travel season if the longest government shutdown in US history drags on.

Starting Friday, the Trump administration will cut flights at 40 airports nationwide by 4% and incrementally increase the reduction to 10% by next Friday if the shutdown continues, according to an emergency order from the Federal Aviation Administration.

Several major airlines have preemptively canceled hundreds of flights scheduled for Friday and into the weekend. The cancellations will impact airlines like a busy weather day, one airline official told CNN. Unlike a storm, however, they will be spread across multiple cities as opposed to a geographic region.

Here’s what to know if the travel ni

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