What is the general purpose of an alternate airport?

The general purpose of an alternate airport is to provide a backup option in case of landing issues at the primary airport. In aviation, alternate airports are designated to ensure that if a flight cannot land at its intended destination due to circumstances such as poor weather conditions, closed runways, or other operational constraints, the aircraft can divert safely to another airport. This is a crucial component of flight planning, as it enhances safety by ensuring that pilots have an alternative available should unexpected conditions arise.

While other options might seem relevant, this choice emphasizes the critical role of planning for contingencies, thereby ensuring that the flight can be completed safely without compromising the well-being of passengers and crew.