Dozens of flights at Boston Logan International Airport were canceled Friday morning, as the FAA-imposed 10% reduction in air traffic goes into effect.

Travelers braced for canceled flights, scrambled plans and holidays stranded in airports as a U.S. government shutdown threatened to snarl trips across the country.

The order is in response to air traffic controllers — who haven’t been paid in over a month as the shutdown drags on — calling out of work in higher numbers as they deal with financial pressure.