As the aircraft climbed through 12,000 feet, the left engine “emitted a series of bangs and streaks of flames.” Pilots returned to the airport after advising air traffic control of an engine stall, and the plane landed safely around 35 minutes after departure. United assigned another aircraft to operate the flight and passengers were delayed a little over 3 hours.
All seems pretty normal, right? Well, two things are notable about this flight: