Two additional Federal Aviation Administration facilities are short-staffed Friday evening, according to an FAA operations update, bringing the total number impacted to 12 for the day.

Millions of Americans expecting to fly this month could have their plans grounded if the government shutdown drags on.

CNN is tracking delays and cancellations for flights traveling to, from or within the US using data from FlightAware. Data updates every 15 minutes.

The Federal Aviation Administration will reduce flights at dozens of major airports as early as Friday if no shutdown deal is reached, Transportation Secretary Sean Duffy announced at a news ...