Fort Knox airspace redraws its lines after a 1960s navigation beacon goes dark

The US aviation agency changed the flight rules around Fort Knox, Kentucky. This means pilots flying there must now follow new boundaries because an old navigation beacon was shut down.

Airspace rules are not static. When a piece of ground infrastructure, like a navigation beacon, stops working, the invisible lines in the sky must be redrawn. This change means pilots and air traffic controllers at Fort Knox must now use updated maps and procedures for instrument flights.