So from the reading I did a while ago on ADS-B, the new kinda-mesh-network-y protocol for planes to report their position to air traffic control, there is basically no security baked into the protocol.
Nothing's encrypted, nothing's signed. Packets may be passed on peer-to-peer to allow traffic data to get around gaps in ground station reception, with no way to authenticate that it came from the original plane untampered-with.
@brion its been a potential vuln since 2012 but nothing too bad has happened - there are various other ways of working out if the 1900 MHz signal is from aircrafts or someone with a transmitter on the ground (unsurprisingly the aviation authorities and the Air Forces won't say exactly what these are or how often the data is audited!)
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