The computer systems responsible for checking you in, are down and passengers have to be manually processed the old fashioned way.
Most delays are between 2 to 3 hours, but many flights are also being canceled because of the glitch.
United has issued a travel waiver for tickets issued for travel today, though I’m pretty sure that won’t be much help to people who had planned to get away for the holiday weekend. Finding an alternative flight may prove to be near impossible.
United Airlines is advising passengers to check their flight status at United.com before leaving for the airport, and if you are heading to O’Hare for a United flight, I recommend preparing for a long wait.