FAA NextGencontrollers can employ the ADS-B datalink to send aircraft flight plans guiding the around traffic conflicts that the on-board system hasn't seen or hasn't resolved quickly by ATC standards. The emergency function that has 2 features; 1, if the on-board system detects an anomaly it will initiate a priority message and datastream to report a potential safety problem to NextGen ATC controllers; 2 in event of rapid airspace congestion issues ATC can use such a priority datalink to re-route the aircraft. This emergency route to the nearest suitable airport will avoid traffic, restricted airspace, weather and terrain.
