[P8riot]

The jet took off at 17:28 local time from Battle Creek Executive airport and climbed to 15,000ft, then at 17:27 “began a rapid descent”

I guess they shouldn't have installed the flux capacitor

[Semper Vigilantis]

That time table had me wondering too.

Perhaps there was structural failure that contributed to their inability to recover. What was done to the wings requiring a stall test? In my experience, any structurally sound commercially made aircraft should recover from a 'normal' stall, give time and altitude. Perhaps they entered a flat spin where the plane is no longer flying, but falling? Do Biz Jets have 'black boxes'?