Just a note to all that there are many "hidden medical disabilities" that not everyone wants to discuss on an airplane. Two of them may be Claustrophobia and motion sickness. I know a few people that suffer from both, and they do not like to disclose this to others, for fear of getting laughed at. Yet they are brave enough to get on airplane and travel for work. Having the window shade open is necessary to prevent illness. Please be mindful of this and be grateful you are in good health.