If a U.S. government shutdown goes on long enough, it could throw a wrench in travel plans, potentially leading to longer airport wait times, flight delays and even cancellations.

The shutdown began Wednesday after President Donald Trump and Congress failed to reach a deal to continue funding government services and operations. That means a vast majority of employees who keep U.S. airports and air travel running are working without pay until the government reopens.

“The longer a shutdown drags on, the more likely we are to see longer TSA lines, flight delays and cancellations, national parks in disrepair and unnecessary delays in modernizing travel infrastructure," Geoff Freeman, president and CEO of the U.S. Travel Association, warned in a statement.

Here’s what to know about the s

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