Drinking water by pilot and cabin crew to maintain the balance in the month of Ramadhan/the Grand Ayatollah Khamenei’s answer

The Grand Ayatollah Khamenei answered a question about drinking water by pilot and cabin crew to maintain their balance during the month of Ramadhan.

Question: If the plane is flying in high altitude and for long distance of about 2.5 to 3 hours, the pilot and the cabin crew need to drink water to maintain their balance, in this case, is it Wajeb for them to fast other days instead and also pay Kaffarah?

The Grand Ayatollah Khamenei: If fasting is harmful for them, it is allowed that they do Iftar by drinking water and fast other days instead and in this condition, Kaffarah is not Wajeb for them.