Austrian Airlines flight OS-418 made a safe emergency landing at Vienna International Airport, Schwechat, Austria, on October 1st.
The Airbus A321-200 flying from Paris, France, was about to land when the crew noticed a strong smell of wet cloth or old socks, and donned their oxygen masks.
The plane landed safely.
No one was injured.

Southwest Airlines flight WN-4266 made an emergency landing in Oakland, California, on April 11th.
United Airlines flight UA-959 made an emergency landing in Chicago, Illinois, on June 23rd.
British Airways flight BA-16 had to return and make an emergency landing at Singapore Changi Airport, Singapore, on July 13th.
An American Airlines flight had to return and make an emergency landing at University of Illinois Willard Airport, Illinois, on February 12th.