All American Airline flights are currently grounded on Christmas Eve due to an unspecified technical issue. AA subsidiaries are also unable to fly, and the company says it cant say when the problem will be fixed Americans tweet rather understated the severity of the problem:Were currently experiencing a technical issue with all American Airlines flights. Your safety is our utmost priority, once this is rectified, well have you safely on your way to your destination.Our team is currently working to get this done. An estimated timeframe has not been provided, but theyre trying to fix it in the shortest possible time.However, an FAA advisory made clear that it was a complete, nationwide grounding for all AA main and subsidiary airline flights.DESTINATION AIRPORT: ALLDEP FACILITIES INCLUDED: ALLPROBABILITY OF EXTENSION: MEDIMPACTING CONDITION: COMPANY REQUESTCOMMENTS: NATIONWIDE GROUNDSTOP FOR AAL MAIN AND SUBSThe fact that all flights are grounded, irrespective of aircraft type, suggests a major IT outage. Some are suggesting that its a ransomware attack, but that is pure speculation as neither the airline nor the FAA has yet provided any explanation.Photo byForsaken FilmsonUnsplashAdd 9to5Mac to your Google News feed. FTC: We use income earning auto affiliate links. More.Youre reading 9to5Mac experts who break news about Apple and its surrounding ecosystem, day after day. Be sure to check out our homepage for all the latest news, and follow 9to5Mac on Twitter, Facebook, and LinkedIn to stay in the loop. Dont know where to start? Check out our exclusive stories, reviews, how-tos, and subscribe to our YouTube channel