[skeater15]

Landing either way is not realistic. Even with no wind airports have a designated runway open. For example a straight North and South "runway" has runway 0 and runway 18, and only one will be open at any given time regardless of windspeed.

[einhard]

If an airport is uncontrolled, planes can land in either direction. Whether the pilots choose to do so is a different matter.

At airports with towers, the controllers can allow landings in either direction. That they usually don't is more of a function of existing traffic.

[sdh9]

Runway 36