The Republican government shutdown has entered its second week and shortages of air traffic controllers have strained operations and disrupted flights across the US. More workers are calling in sick, leaving fewer staff to handle demand. Within 72 hours travelers endured nearly 12,000 flight delays and 200 cancelled flights. Travelers are starting to cancel trips and avoid airports until the Republicans reopen the government, which may not happen for several more days or weeks. That means a longer stretch of time for key workers, air traffic controllers and security screeners, to go without pay. Travelers will see "erosion of service" as frustrated air traffic controllers and TSA officers get tired and call in sick. Reagan National Airport became the latest this week to report delays because of staffing issues. Other affected hubs include Chicago, Newark, Denver, and Nashville, and the tower in Burbank CA had to shut down for several hours.