Last week BA flight 286 from San Francisco to Heathrow was diverted to Vancouver after cabin crew fell ill.
Twenty seven people were taken to hospital but were later discharged.
British Airways has not said what caused the crew to feel unwell but a recording of the call made to air traffic control requesting an urgent landing referred to “toxic gas type fumes”onboard.
The Unite union, which represents 20,000 cabin crew, claims to have evidence that BA has classified the matter as an “odour event” and accuses the airline of “brushing…serious incidents under the carpet”.
ITV News has spoken to Steve Lowy who was on BA flight 286.
He was not ill but photographed paramedics as as they came aboard.
He says the letter BA gave him apologising for the inconvenience caused by the diversion made no mention of any fumes onboard.
Tonight, in a statement, British Airways said: “Safety is always our priority…We continue to conduct thorough and detailed investigations which we share with the CAA (the regulator). We always encourage our people to report any potential incident”
Concerns about the quality of cabin air are not new. When we fly some of the air we breathe is drawn from the engine. As a result potentially harmful chemicals can and do get inside the aircraft.
Richard Westage was a BA pilot. He died in 2012 aged 43. His family believes he was poisoned by repeated exposure to contaminated air. His inquest is ongoing but the CAA told ITV News that the coroner has already ruled this out.
“Fume events” as the industry calls them are extremely rare and when they do happen the government and the regulator, the CAA, insist there is no proof they are harmful.
But the Unite union is taking legal action on behalf of 67 crew members whose health it argues has been damaged.
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