What is the main consideration when filing an IFR flight plan?

The main consideration when filing an IFR flight plan is centered on the expected route and weather conditions. This is crucial because IFR flights rely heavily on instrument navigation and air traffic control instructions due to potential low visibility and adverse weather. By understanding the weather conditions that may affect the flight—such as clouds, precipitation, and turbulence—pilots can choose an appropriate routing that enhances safety and efficiency during their journey.

Additionally, having a clear route planned allows air traffic control to manage aircraft separation and maintain safety in the airspace. This is especially important in congested airspaces or during adverse weather situations. Overall, the expected route and weather conditions are essential for ensuring a safe and compliant IFR operation.