Hi SLF
been meaning to give you the feedback that I do really like the feature to see what OW flights there are from a given airport/country/continent to an airport/country/continent. Seeing ti visually is much better than the list of to/from airports.
I was playing with the tool and realised that it does not flag violations of rule 4(i)
(i) The same city pairs/sectors cannot be flown more than once in the same direction