ATC
A pilot reader, noting my curiosity about the air traffic control system, answered some of my questions and pointed me to a series of columns about ATC written by an actual controller. It's called Say Again.
This is really pretty cool. My reader also helped me understand the difference between a tower, a center, and an approach control facility. (He explained that airspace is dividing among controllers not only horizontally but also vertically, so that two different controller might control airspace at different altitudes above a single point on the ground. This makes me wish for a three-dimensional map of U.S. airspace showing which ATC facility is responsible for controlling flights through each point.)
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