An IFR Flight Plan is a formal document filed by pilots to operate under Instrument Flight Rules. It provides essential information about the flight, including the route, altitude, and estimated time of arrival. This plan is crucial for ensuring safety and coordination with air traffic control, especially in busy airspace. When a pilot files an IFR Flight Plan, they receive clearances and instructions from air traffic controllers. This helps maintain safe distances between aircraft and allows for efficient management of air traffic. The plan is essential for flights that may encounter poor weather conditions or require navigation through controlled airspace.