EASY Question #90:

In what situations can an ATC initiate a re-routing? When might air traffic control initiate a change in an aircraft route? In which situations is re-routing directed by ATC?

Answer:

Re‑routing is necessary when the planned route becomes unsafe. Firstly, re‑routing is a change to the aircraft’s cleared route after departure, issued by ATC or requested by the crew. It commonly occurs due to thunderstorms, airspace congestion, military activity, or aircraft performance issues. In this case, pilots must enter the new route into the flight management system and verify that sufficient fuel remains.