A court in Bayonne, a city in south-western France, has for the first time recognised a flight attendant's breast cancer as an occupational disease, setting a legal precedent that could open the door to similar claims across the aviation industry. The ruling, handed down in early July and confirmed as final with no appeal lodged, concerns Sophie Lainault, a 59-year-old former Air France stewardess and purser now in remission, who accumulated more than 12,600 flight hours between 1989 and 2019 — more than half of them at night.

The court identified three occupational hazards that contributed to Lainault's cancer: prolonged night work, exposure to ionising cosmic radiation, and passive smoking. Smoking was permitted on Air France flights until 2000. Crucially, the court also noted the absence of any genetic or lifestyle factors that might otherwise explain her illness — a finding that strengthened the case for occupational origin. Two regional committees responsible for recognising occupational diseases had previously concluded that no clear link existed, meaning Lainault spent two and a half years fighting for recognition, supported by activists from the CFDT trade union.

The cosmic radiation element carries particular weight. Long-haul flights at high altitude — especially polar routes frequently flown from Paris — expose crew to significantly higher levels of radiation from space, where Earth's magnetic field provides less shielding. A study published this month by Harvard Medical School found that flight attendants and pilots had the highest proportion of radiation-related cancer deaths among more than 500 professions analysed, at roughly 6.9% and 6.7% respectively — higher even than nuclear technologists. Scientists caution, however, that it is impossible to determine whether any individual cancer was caused by radiation alone.

The ruling has concrete consequences for Lainault: she will be able to take early retirement and will receive a lifetime monthly allowance to compensate for income lost during her illness, with any further treatment fully covered by France's public health system. Her lawyer, Élisabeth Leroux, noted that breast cancer already has legal precedent as an occupational disease for nurses, and that this decision now extends that jurisprudence to aviation workers. She also lamented that health professionals are insufficiently trained on occupational risk factors, which hampers both prevention and early recognition.

Because breast cancer does not appear on France's official list of occupational diseases, obtaining recognition remains a lengthy and difficult process for patients. Lainault expressed hope that her victory would embolden others.