United Airlines flight 936 had to made an emergency landing at Newark Liberty International Airport in New Jersey, on August 16.
The flight, heading from Washington Dulles International Airport to Zurich, Switzerland, was diverted as a precaution after 4 crew members reported breathing problems.
The plane landed safely and was thoroughly inspected. Authorities said the sick flight attendants did not need medical attention after landing.
The passengers were accommodated in other flights.