The record-setting federal government shutdown is taking a toll on air travelers , especially at the nation's busiest airports. On Saturday, the FAA's mandate to reduce flights at the country's 40 busiest airports , including San Francisco and Oakland, led to dozens of cancellations and hundreds of delays.

The Transportation Secretary said the reductions are necessary for public safety, as there aren't enough air traffic controllers on duty. Many are working without pay, and those who are on the job are logging long hours, sometimes taking second jobs to cover bills. The FAA has warned that flight cuts could reach up to 10% by next Friday if the shutdown continues.

At San Francisco International Airport, the impact was visible throughout the day. FlightAware reported by Saturday

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