My explanation was incomplete, to make for a good and clear example. If I hadn't seen airplanes and flown in them, I'd still be open to believing they exist. M

My explanation was incomplete, to make for a good and clear example. If I hadn't seen airplanes and flown in them, I'd still be open to believing they exist. My belief would depend on what other evidence there is (broadly speaking), as in my example of the moon landings. It's easier to make a strong judgment about the existence of airplanes, than about the moon landings. I'd argue that most things in life are more like airplanes in that regard.