What is the primary purpose of an Instrument Flight Rules (IFR) flight plan?

The primary purpose of an Instrument Flight Rules (IFR) flight plan is to ensure safety and orderly traffic management. Under IFR, pilots operate on a set of rules that govern flight in controlled airspace and are typically associated with adverse weather conditions or reduced visibility. By filing an IFR flight plan, pilots are able to communicate their intended flight route, altitude, and other important flight details to air traffic control, which in turn helps maintain an organized flow of air traffic and prevents collisions. This structured communication is vital in complex airspace, where multiple aircraft are often operating simultaneously.

While aspects like providing structured routes through uncontrolled airspace or allowing pilots to fly without visibility are components of IFR operations, the overarching goal emphasizes safety and management of air traffic, making it the primary purpose.