Local radio just reported that the incident took place in a building connected to ‘flight training’, which could be a hanger or a classroom.
The person may have been about to be a ‘washout’ and snapped.
Or it could have been a personal affair between the two dead and the shooter, like a love triangle.
Or possibly a Sudden Jihad Syndrome if it was a mooslim................
That was my 1st guess, too.