Visibility being reported as 12 miles, then changed to 4 miles in later news stories.
Same reports state that instructor was on board with Jnr, then also later retracted.
Early news reports also stated that Jnr radioed Air traffic control to notify them of his landing approach, Standard Operation procedure is to launch a search party within 5 minutes of landing, not 14 hours afterwards.
This and other anomalies or the crash are listed in below article
https://www.popdust.com/conspiracy-theory-thursdayjfk-jr-was-murdered-and-you-wont-believe-who-1892591783.html