@Dtl
There is a specific case where WSPR & aircraft are a thing, that is reflecting VHF band transmissions to improve the propagation distance.
But that isn’t what ‘GDTAAA’ is about. It looks for a spot that shows a statistical anomaly. Then there’s a ‘decision’ as to whether that’s due short path, long path, or various combinations of reflection. Of course, the WSPR DB records no timing metadata to discriminate that.