(I have started a new save.)
So, I have a town named Abline. It has an airport that travels to two towns in five planes.
Well, I observed that all the planes used the first runway and not the second runway.
Here is a picture that shows you that planes are using the first runway for take-off and landing:
(http://i34.tinypic.com/2e3rciv.png)
Larger Size (http://i34.tinypic.com/2e3rciv.png)
Any help?
Second runway can NOT be used, because airplane routing behaviour doesn't allow it.
You can read further here: http://forum.simutrans.com/index.php?topic=5806.0
Convois always look for the shortest route. If you want to overrule this, you must set a waypoint in a convoi's schedule (or the line's schedule). It is the same with all convois: trucks, busses, trains, trams, airplanes, ships, etc.
Or use one way signals on the tarmac to select one runaway to land and one to take off
it's the best thing to do.
I had found a solution before you reply. :P
Yes, that is what I do.