The glass used in all commercial airplanes is curved to remain flush with the fuselage. This creates a slight bulging effect people mistake for being the supposed curvature of the Earth. In actuality, if the Earth were a ball, no matter how large, you would NOT be able to see the horizon rise remaining at eye level all the way up. If the Earth were a ball, no matter how big, the horizon would stay exactly where it was and you would have to look DOWN further and …