AeroMéxico flight 3351 had to return and make an emergency landing at Mexico City International Airport, Mexico, on December 23.
The plane took off for Cancún, Mexico, but had to return shortly afterwards after a portion of right engine cover became detached.
The plane landed uneventfully. No injuries were reported.

Germania Airlines flight ST-3356 made an emergency landing in Erfurt, Germany, on September 22nd.
United Airlines flight UA-1549 made an emergency landing at O’Hare International Airport, Chicago, Illinois, on December 4th.