Some have been for a couple months. In any case, figuring out which plane uses which PIA code might seem easy if the patterns are always the same, but that’s still not trivial enough not to be considered as a privacy breach. Everything here sounds a bit like the "yes the house was private but the door was open" robber excuse.
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You're actually right. No inference at all is necessary, because none of Musk's planes are part of the PIA program in the first place:
https://news.ycombinator.com/item?id=34037524
Some have been for a couple months. In any case, figuring out which plane uses which PIA code might seem easy if the patterns are always the same, but that’s still not trivial enough not to be considered as a privacy breach. Everything here sounds a bit like the "yes the house was private but the door was open" robber excuse.