In a statement to CNN, American Airlines said a “technology issue” was “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.”

A source at one affected airport told CNN the airline had reported problems for at least two hours with the system that handles flight bookings, check-in, ticketing, baggage tagging, and other functions. The source added that American sent an update just before 2:45 p.m. ET stating the systems were coming back online and to expect “slight delays as they work towards normal operations.”

Airport officials at Miami International Airport said they were notified about the problem just after 2 p.m. Friday. “We have just been notified about that. We’re waiting to hear if any sites have been impacted yet,” said Greg Chin, communications director at Miami International Airport. The full impact on flights and passengers was not yet clear Friday afternoon.

One passenger in Arizona told CNN he was stuck on an airplane before takeoff. “The flight was supposed to take off at 10:22 a.m. (MT). The app now says 11:30 a.m. (MT), but that’s just a placeholder. The pilot came on and said that AA’s electronic maintenance system is down and they can’t input whatever work was done on the plane and then accept it, so we’re stuck until that system comes back up,” Jason Hass said.

A passenger in Charlotte, who was scheduled to leave at 1 p.m., told CNN they were about to take off just before 3 p.m. The passenger, John Noona, said airline officials told them the “main system” had gone down. He added he had been stuck on the ground for nearly two hours. The Federal Aviation Administration, as well as officials at airports in Chicago and Dallas, referred questions to the airline. (CNN)