Automatic flight information determination device for automatically determining flight control information for an accompanying mobile machine accompanying a leader mobile machine, said device being adapted for collecting the location data of the leader mobile machine from among the actual location data derived from measurements relating to the current location of the leader mobile machine and the current trajectory data of the accompanying mobile machine, and of determining, on the basis of said location data collected, the information items for piloting the accompanying mobile machine as a function of a set of at least two values to be adhered to with respect to the location defined by the data collected, said values to be adhered to being representative of the values included among: a minimum vertical/flight level separation value, a minimum longitudinal/along track separation value, and a minimum lateral/between tracks separation value.