The US keeps removing old radio beacons, forcing airspace maps to change

The US aviation agency is changing the boundaries of controlled airspace near Alma, Michigan. This update is necessary because a ground-based radio navigation beacon in the area has been shut down.

For decades, pilots relied on a network of ground-based radio beacons to navigate. The US aviation agency is systematically decommissioning these beacons, pushing pilots to rely more on satellite navigation. This specific rule is a small, administrative step in that long transition.