In some examples, a system is configured to receive composite air traffic radio surveillance data from one or more relaying aircraft, the composite air traffic radio surveillance data comprising air traffic radio surveillance data from the one or more relaying aircraft and air traffic radio surveillance data relayed by the one or more relaying aircraft from one or more additional aircraft. The system is further configured to receive data from one or more non-aircraft data sources, and aggregate and de-conflict the composite air traffic radio surveillance data and the data from the one or more non-aircraft data sources, thereby generating an aggregated and de-conflicted data set. The system is further configured to generate an output based at least in part on the aggregated and de-conflicted data set.