U.S. airlines canceled hundreds of flights after the FAA ordered traffic cuts at 40 of the nation’s busiest airports, a move tied to the government shutdown and strained air traffic control staffing. More than 500 Friday flights were scrubbed as carriers began phasing in a 4% reduction that could rise to 10%. Delta planned about 170 cancellations, United 145 and American 32, according to Cirium. The changes, which will last until safety data improves, could ripple to smaller airports and even package hubs, while major airlines offer refunds as anxious travelers shuffle plans.

Prepared by Christopher Adams and reviewed by editorial team.