[brian51]

Firstly, I really like Marlande.. the layout of the larger river + the 2 smaller rivers you have here is a favorable set up to me

I like the location of your CBD.. in fact i am quite sure that is where I would have placed this also

I really like how you used the subway system and it seems you have an excellent balance with using 8 subway tunnels  for handling the traffic..

I think it was about what i was expecting compare to how many use your road systems..

on the airport non function :

I have noticed this type of thing in my cities sometimes also. It seems to happen most often when I first start playing, but it goes
away as i run the city longer.. Try doing this Pierre , and please let us know if this solves it ?