U.S. airlines again canceled more than 1,000 flights Saturday, mostly because of the government shutdown and the Federal Aviation Administration's order to reduce air traffic.

The slowdown at 40 of the nation's busiest airports is now in its second day and so far hasn't caused any widespread disruptions. More than 1,000 flights were canceled Friday, according to FlightAware, a website that tracks air travel disruptions.

Related video above: What to do if your air travel is impacted by the government shutdown

THIS IS A BREAKING NEWS UPDATE. AP's earlier story follows below:

Hundreds of flights at the busiest airports in the U.S. are being scratched this weekend as airlines move forward with reducing air service due to the lingering government shutdown.

So far, the Federal Aviation Admi

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