An American Airlines Boeing 737-800, registration N944AN performing flight AA-2556 from San Francisco,CA to Chicago O'Hare,IL (USA), was enroute at FL390 about 60nm southeast of Denver,CO (USA) when the crew requested to divert to Denver advising ATC they had a "little bit of potential engine (CFM56) problem" that might require them to shut the engine down. The aircraft turned around, the crew subsequently declared Mayday and required FL270, shut the engine down, further descended to FL220 and landed safely on Denver's runway 16L about 40 minutes later.
A passenger reported the crew announced they were observing an engine oil leak and needed to shut that engine down. After landing they were told, a mechanic had observed physical damage to the engine.
The occurrence aircraft is still on the ground in Denver about 38 hours after landing.
https://flightaware.com/live/flight/AAL2556/history/20250615/2150Z/KSFO/KORD
A passenger reported the crew announced they were observing an engine oil leak and needed to shut that engine down. After landing they were told, a mechanic had observed physical damage to the engine.
The occurrence aircraft is still on the ground in Denver about 38 hours after landing.
https://flightaware.com/live/flight/AAL2556/history/20250615/2150Z/KSFO/KORD
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