Air traffic control shortages add to U.S. flight delays

• The government shutdown is exacerbating concerns about the strain on air traffic controllers, a shortage of whom has vexed airline executives for years.

• A shortfall of already-thin air traffic control staffing this week had prompted the FAA to slow or halt arrivals in Burbank, California, and Nashville, Tennessee, among others.

• About 10,000 flights were delayed on Monday and Tuesday, but disruptions dropped on Wednesday to just more than 1,900.