The record 38-day U.S. government shutdown is severely affecting air travel, with 13,000 air traffic controllers and 50,000 security screeners forced to work without pay. The Federal Aviation Administration has ordered a 10 percent reduction in flights at 40 major airports as rising absenteeism creates staffing shortages. This has caused hundreds of daily cancellations, disrupting tens of thousands of passengers just as the busy Thanksgiving travel period approaches.