Is that not the medium airport? Or do you want an airport with 2 dirt runways avalable at same time as the small airport?

Airports seem to be very fussy about how you connect run- and taxiways and for the small airport also the order in which you define them, so I'm not surprised you had problems. Took me a long time to get the current one to work.

Originally posted by Dirkels:

Airports seem to be very fussy about how you connect run- and taxiways and for the small airport also the order in which you define them, so I'm not surprised you had problems. Took me a long time to get the current one to work.

The current large airport you made is great. Actually think this is the max you can get without altering the layout. Also understand that it is not possible to have all three runways leading in the same direction as "taxi to gate" paths cannot overlap.

GENERAL LAYOUT
I had some ideas for layout for a 4-6 runway airport, but it really is beyond my technical capability to implement anything. If you had a central area where the terminals are, and then three landing runways on one side, and two/three take-off runways on the other, it would work beautifully. Planes land on one side, taxi to the terminal in the center, and taxi to the takeoff runways to the other side. It sort of is the ATL (Atlanta Hartsfield) layout.
https://upload.wikimedia.org/wikipedia/commons/9/9d/ATL_map.png
https://upload.wikimedia.org/wikipedia/commons/thumb/d/d9/Atlanta_Airport_Aerial_Angle_%2831435634003%29_%282%29.jpg/1920px-Atlanta_Airport_Aerial_Angle_%2831435634003%29_%282%29.jpg
http://www.city-data.com/forum/attachments/atlanta/77532d1301204691-city-study-2nd-airport-sixth-runway-hartsfield-jackson-atlanta-international-airport.jpg

RUNWAYS LAYOUT
To avoid the "taxi to gate" paths overlap, one could stagger the landing runways.
1- One option is to actually design runways as staggered: runways are staggered (parallel runways of the same length, but starting at different points) and planes exit at the end of the runways without overlapping paths.
2- Or, runways are designed with the same length, but with different landing and taxing nodes. Taxiways are designed between runways "first runways, plane lands at the threshold; second runway lands 1/3 way down the runway; third runway, plane lands at the middle point". This would look great and work as point 1.
http://slideplayer.com/slide/1705001/7/images/49/Staggered+Parallel+Runways.jpg
https://image.slidesharecdn.com/atcbriefce4674-150816155153-lva1-app6891/95/air-traffic-control-and-runway-separations-75-638.jpg?cb=1439740446

TRANSPORT HUB
Finally, it would be great if a transport hub (Train, Tram, Bus) would be included in the airport design. We really need this to make air transport more viable TpF. All transport modes in one hub=shorter travel times and more passengers.



Sorry, I am a bit of an aviation nerd... love TpF and really like using extra large maps with connecting aviation hubs in them...

@Dicapitano: funny was also thinking about he Atlanta airport as a possible layout but after doing a lot of testing I'm not sure if it is posible. For example if I just copy the current layout of the large airport to opposite side of terminal buildings it does not want to build, when I remove the taxiway from second landing runway to the second take-off runway (needed to reach terminal buildings) it does build. It also builds if I remove the original runways and taxiways. So there might be more restrictions in airports than train stations.

But an underground train station like we have at Shiphol Airport (Amsterdam) is on my whish list too but might take a lot of experimentation for the underground part. Tram and bus station should be easy compared to that.

And Dirkels, I'd like to make a quick footnote that aircraft DON'T land in two directions, like in the mega-airport that you made. Perhaps converting that third runway into a departure runway would add a bit more realism.