On a typical early November day, more than 1,000 flights can take off and land at Logan International Airport in Boston .

The volume is lower than in the peak summer months, when the average number of daily arrivals and departures eclipses 1,200, according to data from the flight tracking website FlightAware . But it’s enough that a 10% reduction in flights — like officials at Logan and other major airports are bracing for — can mean dozens of flights canceled each day.

Logan was one of 40 high-traffic airports ordered to reduce flights this week amid a shortage of air traffic controllers caused by the federal government shutdown.

As the shutdown hit five weeks on Wednesday, U.S. Transportation Secretary Sean Duffy said the airports would need to reduce flights by 4% beginning Fri

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