"This is about where’s the pressure and how do we alleviate the pressure," Transportation Secretary Sean Duffy said.

San Francisco International Airport was among the major U.S. air-travel hubs to face cancellations as the federal government places limits on air travel.

The Federal Aviation Administration is cutting 10% of flights at many of the nation's busiest airports across the country starting Friday. This includes Logan International Airport in Boston, which could affect some Massachusetts residents.

American Airlines said that the 4% reduction will mean 220 canceled flights per day. The vast majority of impacted American Airlines flights are regional, and there’ll be no impact to international flights including Mexico, Canada and the Caribbean, CEO David Seymour said in a letter to employees. Further hub-to-hub routes impact will be minimized.

The Hawaiʻi Department of Transportation has requested a full waiver from the air traffic reduction at all Hawaiʻi airports. If it’s granted, the state says it will pay for the essential staff needed to maintain full flight schedules.

Airlines said they will cut flights across Bay Area airports this weekend to meet Federal Aviation Administration staff shortages because of the federal government shutdown.

The FAA ordered airlines to cut thousands of flights beginning Friday as the agency deals with air traffic controller shortages during the government shutdown.