Hundreds of flights have been cut nationwide by the Federal Aviation Administration amid the ongoing government shutdown , which is now the longest in U.S. history.

Travelers planning to fly out of Logan International Airport could be in for a headache Friday, with Massport confirming Thursday that Boston was on the FAA's list of 40 "high-volume" markets it would be reducing air traffic at.

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Massport warned Thursday that some people traveling over the next few days at Logan should anticipate delays and cancellations. Beginning Friday, 4% of flights at the busiest airports across the nation will be cut, and that number is expected to increase if the shutdown continues.

As of around 6 a.m., 20 flights scheduled f

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