A method sharing data between aeronautical equipment items. At least one equipment item is included in an aircraft carrying out a flight mission. The method includes obtaining a set of data coming from said equipment item. The method further includes adding of the set of data to a common group including data common to all aeronautical equipment items. The method incudes filtering the data of the common group in order to determine at least one first relevant datum for successfully completing the flight mission. The method incudes transmitting, to at least one other equipment item, of only the at least first relevant datum to be used for a display to a respective user, or for a computation, of a command of the aircraft.