How do you explain the difficulty with hot cabins?
Do you have any knowledge of Human Physiology or oxygen deficit with the reduced cabin pressure and reduced oxygen at elevated altitudes in a plane or climbing a high mountain? Of course, you realize they have similar effects! These medical conditions are not studied in General Biochemistry.

Last nite, I confirmed these problems with a friend at NASA, who is trained in Aeronautical Medicine and Emergency Medicine, who cares for the astronauts and works at Mission Control for the shuttle flights. But want to assure you we did not discus or laugh at the thought of cultural differences of the various astronauts having similar problems!

If this problem is so common on JAL and other Asian airlines, it is a matter to be investigated by the FAA or other responsible agencies!