Aerhhm ... - I was never good at mathematics, but I hope I have found a useable way
to visualise a pilot's achievements with long, line-crossing flights here.
You can see it as "average points per flight", or as a grade the pilot has achieved.

Vice-President of the BOC (Barmy OFFers Club)
Member of the 'Albatros Aviators Club' - "We know how to die with Style!"