Lufthansa flight LH-506 had to return and make an emergency landing in Frankfurt, Germany, on August 1st.
The Boeing 747-800 plane took off for Sao Paulo, Brazil, but had to return shortly afterwards due to a strong odor of fuel on board.
The plane landed back safely. Several passengers reported feeling unwell and were treated at the airport.
TuiFly flight X3-2985 made a safe landing at Stuttgart Airport, Filderstadt, Germany, on July 19th.
The Boeing 737-800 flying from Mallorca, Spain, was about to reach when two of the crew members started feeling unwell.
The plane landed safely.
No one was injured.
Air New Zealand (ANZ) flight NZ-87 had to return and make an emergency landing at Auckland Airport, New Zealand, on July 5th.
The Boeing 777-200 flying to Hong Kong, China, was over the Tasman Sea when the pilot started feeling unwell.
The plane landed safely.
No one was injured.
Flybe flight BE-4447 made an emergency landing in Birmingham, England, on May 30th.
The plane heading from Doncaster, England, to Faro, Portugal, was diverted after the crew reported that the captain was feeling unwell and that they were also experiencing technical issues.
The plane landed uneventfully. Everyone aboard remained safe.
Gulf Air flight GF-506 had to return for an emergency landing in Bahrain, on March 9th.
The Airbus A320-200 plane took off for Dubai, United Arab Emirates, but had to return shortly afterwards after the first officer reported feeling unwell.
The plane landed back safely. The first officer was shifted to hospital.
Alaska Airlines flight AS-322 had to make an emergency landing in San Jose, California, on January 12th.
The pilots declared an emergency after the crew noticed a white powder leaking from the cabin air conditioning vents and three of them reported feeling unwell. The Boeing 737-900 plane was flying from Seattle, Washington, at the time.
The plane landed safely. One crew member was taken to hospital while two others received treatment at the airport. All 181 passengers remained unharmed.
It is believed that the white substance was a de-icing agent.
Cargolux Airlines flight CV-856 had to divert for an emergency landing in Vienna, Austria, on January 11th.
The Boeing 747-800 plane flying from Luxembourg to Dubai, United Arab Emirates, was diverted after the captain began feeling unwell and subsequently became incapacitated.
The plane landed safely. The captain was rushed to a hospital.
United Airlines flight UA-1584 had to divert and make an emergency landing in Salt Lake City, Utah, on November 16th.
The Boeing 757-200 plane heading from San Francisco, California, to Newark, New Jersey, was diverted after the captain began to feel unwell.
The plane landed safely.
Ellinair flight EL-920 made an emergency landing in Novosibirsk, Russia, on August 9th.
The plane was flying from Thessaloniki, Greece, when the captain became unwell and later on fell unconscious. The first officer took control and landed safely.
The captain was shifted to hospital where the doctors diagnosed a brain haemorrhage.
British Airways flight BA48 made an emergency landing at Heathrow Airport in London, United Kingdom, on February 22nd.
It is believed that the pilot requested priority landing after a passenger became unwell. The plane was flying from Seattle, Washington, at the time.
The medical teams were ready at the scene as the plane landed safely.