What should a pilot do if the weather conditions deteriorate just before reaching the destination?

When weather conditions deteriorate just before reaching the destination, filing for another airport is the most prudent choice for a pilot. This action allows for flexibility in navigating adverse conditions. It ensures the pilot can land safely at an alternate airport that may have better weather or more suitable landing conditions. By filing for another airport, the pilot can maintain flight safety and avoid potentially hazardous situations, such as trying to land in poor visibility or turbulent conditions.

The alternative options pose significant risks. Continuing to the destination without considering the new weather conditions can lead to dangerous situations, including reduced visibility or inability to land safely. Returning to the base, while sometimes necessary, may not always be viable, especially if fuel or time constraints limit the ability to safely return. Flying at a higher altitude could exacerbate the situation, as it would not address the core issue of safe landing conditions while potentially increasing the risk of encountering icing or other hazards at higher altitudes. Therefore, filing for an alternate airport is a proactive and safer decision for pilots in such situations.