1. An aircraft communication system for establishing a datalink network between participating aircrafts, each participating aircraft having an ADS-B Mode-S datalink transponder adapted to send and receive ADS-B messages over an ADS-B standard communication protocol, wherein said ADS-B Mode-S datalink transponders establish said datalink network via an ADS-B standard communication protocol by transmitting event driven ADS-B messages having a predefined structure identifying said ADS-B messages as Type 23 ADS-B test messages and including message data, thereby providing a datalink network established by transmission of solely ADS-B messages compliant with said ADS-B standard communication protocol.