It's also worth pointing out that American Airlines operates over 600 aircrafts that travel to around 260 countries, so based on that information, that's certainly a lot of flights being grounded. American Airlines stopped dispatching new flights, stopped boarding new flights, and stopped allowing people to check in starting at around 11 am CT, so the delay will last around six hours, according to when the airline first tweeted the issue. We're not sure how they'll manage to get everything back on track, but we're guessing that employees will be working overtime for the next few days in order to get caught up. UPDATE: American Airlines says that their "systems have been fully restored ," but as expected, there will be "continued flight delays and cancellations throughout the remainder of the day." [ via CNBC]