One first officer was declared incapacitated at 30,000 feet and placed on supplemental oxygen.
The other two flew the Boeing 777-200ER into London Heathrow while developing symptoms of their own. Those symptoms worsened after landing after 10 hours and 30 minutes, and they were assisted by medical staff.
Flight BA276 left Rajiv Gandhi International Airport following an overnight crew layover, according to FlightAware data cited by Fox News.
The three pilots ate breakfast together in the club lounge of their layover hotel on the morning of the flight on July 22, The Sun reported. All three also drank bottled water supplied by an outside provider.
British Airways confirmed to Fox News Digital that one of its pilots became unwell, but the flight's safety was never compromised.
