A British Airways flight was forced to divert after one of the pilots fell unconscious.
The London to Athens Boxing Day flight ended up stopping in Zurich after the co-pilot fell ill.
The primary pilot of the A320 Airbus had intended to fly all the way back to London Heathrow to get the co-pilot medical help.
However, they were forced to land in Switzerland when their colleague's condition deteriorated further and they passed out.
The plane touched down in Zurich without incident, allowing the co-pilot to get medical help.
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They have since recovered well, Simple Flying reported.
The BA flight later continued to Athens where it arrived nine hours later than originally intended.
A spokesperson for BA said: "The safety of our customers and crew is always our top priority and the flight continued to its destination as planned.”
A BA insider told MailOnline : "The First Officer had initially complained of feeling ill, but on the return to Heathrow passed out.
"The Captain thought the situation was serious enough to divert rather than try and return to Heathrow.
"It is nothing to do with COVID-19 and there are no reports of any toxic fumes in the cockpit which is a common cause of pilots suddenly becoming ill.
