Is this normal for EWR-MIA?
GCM shows this route.
GCMap shows only a great circle line (i.e. the shortest distance between two points on a sphere). This is not the actual route traveled at all, which takes into account weather, politics, distance to divert options, etc.Flight Aware would show you the actual route flown.Compare ICN-JFK on GCmap (chose Rectangular (Plate-Carree) as the projection) to FA's map of Korean flight 81 for example: