If you look at the FAA diagram you can see the triangle. This is how airports used to be built in the early aviation days, so the runway configuration in a triangle is mostly for historical reasons. Also, remember that there is only a certain amount of crosswind that allow for safe airport operations (the crosswind ratings also depend on plane type), so you need to have runways in the direction of the prevailing winds. If these directions change seasonally, you better have runways that can accommodate these changes or you'll end up with a closed airport during times where the wind is blowing in the wrong direction.


Awesome vid!