noondlyt, 
It is not going to be JUST the 737 Max or 737s. Think about it. The policies were in place for all aircraft.
Southwest Airlines Plane Loses Engine Cover During Takeoff | HuffPost Latest News https://www.huffpost.com/entry/southwest-flight-engine-cover-emergency-landing_n_6612f8b6e4b0d81853f99d9a
