Norwegian Air International flight D8-371 had to make an emergency landing at Gatwick Airport, England, on May 17th.
The Boeing 737-800 plane took off for Helsinki, Finland, but had to return shortly afterwards after the crew noticed an issue with the slats.
The plane landed back safely. There were 183 people aboard at the time; all of them remained unharmed.

American Airlines flight AA-134 had to return and make an emergency landing in Miami, Florida, on September 1st.
Qantas Airways flight QF-10 had to divert and make an emergency landing in Singapore, on February 6th.

GETJET Airlines flight GJT-101 made an emergency landing in Vilnius, Lithuania, on November 25th.