AUSTIN, Texas (KTRK) -- Travelers departing Austin-Bergstrom International Airport are experiencing delays Wednesday evening, with average wait times exceeding an hour, officials said. The Federal Aviation Administration (FAA) revealed it ordered a ground delay to slow traffic due to staffing issues in the airport's air traffic control tower. As a result, some travelers face an average delay of about 90 minutes. The delays come after the FAA issued a ground stop at about 3:55 p.m., which has since been lifted. The current ground delay is expected to remain in effect until 9:59 p.m. This is a developing story. Eyewitness News is continuing to gather facts. Watch live breaking news coverage from ABC13 on our 24/7 streaming news channel. RELATED: Newark problems and recent crashes put focus on air traffic controller shortage and aging equipment