Even some pilots don't like to wear hats.
However, I think that ANA/JAL pilots (no confirmed) must wear hats for their safety reasons. If an oil dropped from the wing to the pilots' head/eye while they were checking the aircraft, then it's likely the pilot may be unfit for work.
However, I think that ANA/JAL pilots (no confirmed) must wear hats for their safety reasons. If an oil dropped from the wing to the pilots' head/eye while they were checking the aircraft, then it's likely the pilot may be unfit for work.