Batik Air flight ID-6853 had to return and make an emergency landing at Sultan Syarif Kasim II International Airport, Pekanbaru, Indonesia, on May 9th.
The Boeing 737-800 flying to Jakarta, Indonesia, had to return after losing cabin pressure.
The plane landed safely.
Two among the 91 people aboard suffered respiratory and ear problems. One of them had to be taken to hospital.
Germanwings flight 4U-7218 had to return and make an emergency landing in Hamburg, Germany, on January 29th.
The Airbus A319-100 plane took off for Stockholm, Sweden, but had to return shortly afterwards after the crew reported an unidentified odor on board.
The plane landed back uneventfully.
Three passengers were taken to hospitals with respiratory problems while several others were treated at the airport.
American Airlines flight 564 made an emergency landing at Los Angeles International Airport, California, on February 11th.
Authorities said the plane, heading from San Jose, California, to Phoenix, Arizona, was diverted due to a mechanical issue.
The plane, carrying 125 passengers and 5 crew members, landed uneventfully.
Eight people, including seven passengers and one crew member, reported respiratory irritation and were evaluated by paramedics. Authorities said one of them was later taken to hospital.