It is also thought that the woman was also suffering from acute heart failure in the lead up to her death.
Flight attendants then had no option but to lie the victim down in the aisle and cover her over with a blanket after she passed away.
The captain of the flight also decided to fly directly to Moscow instead of making an emergency landing.
The woman is believed to have suffered acute heart failure leading to her death.
The event of a mid-flight death is one of small probability when taking into account the vast number of daily passengers, but major airlines usually have plans in place to deal with such unexpected tragedies.
Some cabin crew are ordered, for example, to move the deceased to empty rows in first or business class sections of the plane, while larger planes are even equipped with a 'corpse cupboard' so flight attendants can keep the body out of sight.
Meanwhile people with diabetes can take insulin with them onto aircraft despite tight new security restrictions.
Passengers are required to show a letter from their doctor explaining they need to carry insulin and/or syringes on board.