A note about Estimated coverage: when you see a dashed or gray line behind an aircraft, that's estimated coverage. Colored lines indicate actual positions.

On the FlightAware tracking map, a grey line (often appearing as a dotted or dashed line) indicates that the aircraft is currently out of land-based radar or ADS-B coverage. This most frequently happens when a flight is over a large body of water, such as the Atlantic or Pacific Oceans, or over extremely remote terrain where ground receivers cannot pick up the plane's signal. During these periods, FlightAware uses the flight's "filed flight plan" and last known speed/position to create an estimated trajectory. Once the aircraft comes back within range of a ground station or a satellite-based tracking provider, the line will turn back into a solid color (usually green or blue, depending on the view) to indicate "live" tracking data. The grey line is essentially the system's "best guess" of where the plane is based on its intended path.