The federal government shutdown has entered its second week, and already shortages of air traffic controllers have strained operations and disrupted flights at some U.S. airports.

Reagan National Airport became the latest this week to report delays because of staffing issues on Wednesday. But earlier in the week there were also problems at airports in Chicago, Newark, Denver and Nashville, and the tower even had to shut down for several hours in Burbank, California.

Experts, as well as union leaders representing air traffic controllers and security screeners, warn that the impact could grow significantly worse if the shutdown continues and employees start to miss paychecks.

Here are the airports experiencing staff shortages due to government shutdown

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