This document discusses factors that must be considered when planning an IFR flight, including origin and destination, weather, route, distance, speed, weight and balance, fuel, and alternates. It also describes the components of a flight plan such as the fuel plan, weight restrictions, navigation plan, air traffic services routing, and weather forecast. Finally, it provides details on various stages of flight like standard instrument departures, transitions, enroute navigation, standard terminal arrivals, instrument approach procedures, and ETOPS flights.