The FAA changed how planes fly in bad weather. Nobody knows how.

The Federal Aviation Administration (FAA) updated its rules for how planes fly using instruments in bad weather. These changes affect specific routes and altitudes, but the document does not say which ones or how they changed.

The FAA regularly updates flight rules to keep up with changes in air traffic and technology. These small, frequent adjustments are usually technical and specific, affecting only a few routes or procedures. This document is unusual because it announces changes without specifying what they are, making it impossible to tell what actually changed for pilots or air traffic controllers.