Travelers could face major disruptions as the ongoing federal government shutdown begins to take a toll on the nation’s air travel system.

Transportation Secretary Sean Duffy announced a 10% reduction in air traffic at 40 of the nation’s busiest locations, a measure set to take effect Friday, Nov. 7. The move comes as staffing shortages worsen across key aviation sectors, including air traffic control and airport security.

The shutdown has already led to longer lines, delays and flight cancellations at some airports.

At MacArthur Airport in Ronkonkoma, however, operations have not yet been affected.

“Luckily the government shutdown has not affected operations here at MacArthur Airport, and we’re very fortunate,” said Rob Schneider, MacArthur Airport’s Commissioner of Aviation. “We sit outside of the congested airspace for the New York City airport, JFK, LaGuardia and Newark have a different airspace.”

Travel experts remind passengers that if a flight is canceled due to the shutdown, they may be entitled to a refund or travel credit. Travelers are urged to contact their airline or booking agency directly for assistance.