American Airlines passengers across several cities were left stranded and reeling on Friday due to a reported system outage that grounded flights for hours. The Daily Mail reported that the outage heavily affected flights in Chicago, Los Angeles, Dallas, New York, Phoenix, and more cities, as frustrated passengers reported they were being left in the dark over the delays. “Sitting at the airport, they are saying AA flights everywhere are impacted by maintenance system being down. Anyone know anything???” a passenger shared to Reddit. The post quickly brought more comments with another user also sharing, “Sitting on Phoenix tarmac it’s system wide digital signature system down. Can’t think of a worse tarmac to spend the afternoon 🥵💦.” According to reports, issues with the airline’s system began around 1:30 p.m. ET. Around 3 p.m. the airline said systems were returning to normal, CNN reported. The airline said a “technology issue” was to blame, “affecting connectivity” for some of its systems. “We are working with our partners to fully resolve the issue,” the airline said. “Though we are experiencing delays as a result, we have not canceled any flights at this time.” They added, “We apologize to our customers for their experience.”