It’s relatively common on Japan Airlines flights (or at least it was on last night’s Tokyo-to-Hanoi flight) for passengers to wear surgical masks, presumably out of fear that circulated fuselage air contains high levels of bacteria. Incidentally, I sat in coach from Honolulu on and nobody leaned their seat back into my 18 inches of private space. In fact no one leaned their seats back at all. Do Asian people understand more clearly how rude and thoughtless this is? Or were they simply fortunate enough to be born without the American asshole gene?
