Singapore Airlines flight SQ-958 made an emergency landing in Singapore, on April 21st.
The plane, heading to Jakarta, Indonesia, had to return after the passenger oxygen masks deployed without any obvious reason.
The plane landed safely. There were 113 passengers and 12 crew members aboard at the time; all of them remained unhurt.
KLM flight KL-1072 had a cabin pressure problem shortly after it took off from Manchester, United Kingdom, on April 9th.
The Boeing 737-900 plane was heading to Amsterdam, Netherlands, when it experienced problems with cabin pressure. According to the airline, the oxygen masks were released for the passengers and the crew was able to restore the air conditioning system after around 13 minutes.
The plane landed safely. All 138 passengers aboard remained unhurt.