The extra flexibility for travelers comes as the FAA is mandating flight reductions at many airports amid a shortage of air traffic controllers. United Airlines, American Airlines, and Delta Air Lines said they will refund tickets for customers who will be flying starting on Friday, November 7, after the Federal Aviation Administration (FAA) announced a 10% reduction in flights at 40 major airports, expected to affect some 3,500 to 4,000 flights daily.