A French court has for the first time recognized cosmic radiation as a factor in the breast cancer of a long-serving flight attendant.

Sophie Lainault, a 59‑year‑old former Air France stewardess, sought to have her cancer recognised as an occupational disease brought on by conditions at work. In Bayonne, the ruling that cosmic radiation was one of three carcinogenic hazards arising from her profession cleared the way for her early retirement and full medical reimbursement.

The court named passive smoking and prolonged night work as the other two hazards, noting that smoking was permitted on Air France flights until 2000. The court’s decision means Lainault, who is now in remission, may receive lifetime compensation for medical treatment and early retirement benefits.

Air France officials said the company had played no part in Lainault’s legal case and has not seen the reasoning behind the court’s decision. The airline emphasised that it already provides medical coverage above regulatory minimums, but the ruling raises questions about broader safety supplements for crew.

A Harvard Medical School study released this month found flight attendants and pilots had the highest proportional death rate from radiation‑related cancers among over 500 professions. The study reported that 6.9% of deaths among flight attendants and 6.7% among pilots were due to such cancers, exceeding even nuclear technicians who work with non‑cosmic radiation.

Scientists explain that flight crews, especially those flying long routes near the poles, are exposed to higher levels of cosmic radiation because the Earth’s magnetic field offers less shielding at high latitudes. Though individual cancer risk from radiation is hard to confirm, the cumulative exposure at high altitude may offer a “small additional risk” that was previously unacknowledged.

“My dearest wish is that the decision encourages other women who up until now have not had the courage to take this step,” Lainault said. By pioneering this recognition, the court may open avenues for countless other flight crew members seeking occupational health justice.

An Air France Airbus A220‑300 plane at Warsaw Chopin Airport