I wouldn't quibble with the point you make deltafox44.
I think it's interesting that the flight from Nantes to Cardiff was being envisaged - by Sala - from the outset as a night flight . He says "I have a flight going tomorrow to Nantes and return Monday night to Cardiff. Willie McKay called me".
This wasn't a case of Sala showing up late for take off on the Monday . Even the previous day it had been planned to be a night flight.