Thanks all for the help on the forum. I think I know enough now to be mediocre.

On to my question!
Okay.
I have read the manual, and I know what it means, but I am trying to work out how it would work in practice.
I understand that you can only fly to and from your bases (no alliances)
Legend:
X = Base
A = City 1
B = City 2
C = City 3
If I have a route that goes as follows: X---A---X--B---X---C---X, then in the day (24 hours in game time) the aircraft flys this. The next day the aircraft then does the same again.
But I can't figure out how the .5 works.
If it goes: X---A---X---B---X---C, will it automatically fly back to X to start the next route?
And, how does it know the sequence of routes? Is there somewhere the link them?
Thanks.