If you think about it for a second, it is astounding how safe commercial aviation has become, considering that pilots see so little. They see out cockpit windshields, straight and a bit to the side, during daytime, when views are not obscured by clouds. Everything else, above, below or behind, at night, in clouds or fog, is mostly invisible. Ground control, runway lights, onboard technology and elaborate rules keep largely blind aircraft safe. But rules impose delays and other costs. New ...

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