What is the purpose of releasing a flight plan prior to departure?

The purpose of releasing a flight plan prior to departure is to confirm that your flight is cleared with Air Traffic Control (ATC). By submitting a flight plan, you are formally notifying ATC of your intended route and altitude. This crucial step ensures that air traffic controllers are aware of your flight details, allowing them to provide guidance and manage air traffic effectively, which enhances safety and coordination among different aircraft.

While a flight plan may suggest an optimal route, it is primarily there for ATC to manage and ensure the safe separation and sequencing of aircraft. The flight clearance received through the flight plan process confirms that you are authorized to proceed with your departure. Thus, it is an essential aspect of flight preparation, ensuring all proper procedures have been followed prior to takeoff.