Description:
When building a building or anything, you have to remove the existing fence/wall or whatever before being able to build over it. The idea is to have some way of placing a building, that automatically deletes the structures over which you build it. At the moment removing fences and existing walls is time-consuming when wanting to extend your airport.
Why it should be implemented:
Makes it easier to extend or upgrade the airport, consume less time removing placed fences and walls.
While this is a cool idea, and one that could improve the way people build, this should be, and if implemented, will be an extremely low priority upgrade in comparison to other projects.