More than 2,000 flights remain cancelled on Saturday just one day after the U.S. Federal Aviation Administration ended a nationwide ground stop. While a limited number of U.S. domestic flights departed on Friday evening, U.S. officials say the effects of the stop could be felt for days, adding that the system will likely be operating normally in time for the U.S. Thanksgiving travel rush. This is just the second nationwide ground stop in the United States since the Sept. 11, 2001, attacks. Follow along for key updates: