Croatia Airlines flight OU-460 had to return and make an emergency landing in Zagreb, Croatia, on November 21st.
The plane took off for Zurich, Switzerland, but had to return shortly afterwards due to an issue with the de-icing systems.
The plane landed uneventfully. There were 66 people aboard at the time; all of them remained safe.

UPS flight 5X-104 had to divert for an emergency landing at New Chitose Airport in Hokkaido, Japan, on March 8th.
Blue Air flight 0B-2931 had to return and make an emergency landing in Bacau, Romania, on August 10th.
Jet2.com flight LS-362 had to make an emergency landing at Belfast International Airport in Northern Ireland, United Kingdom, on March 24th.