What does the acronym IFR stand for in aviation?

The acronym IFR stands for Instrument Flight Rules. This set of regulations governs the procedures for flying aircraft under instrument meteorological conditions, where pilots rely on instruments and navigation aids rather than visual references to control the aircraft and navigate. IFR is crucial for flight safety, particularly when visibility is limited due to weather or other factors. It dictates how flights should be conducted in controlled airspace, requiring pilots to follow specific protocols to communicate with air traffic control and maintain safe separation from other aircraft. This allows for greater efficiency and safety in aviation operations, especially in busy airspaces.

The other acronyms provided do not have established meanings in aviation terminology. While International Flight Regulations might sound plausible, it does not correspond to a widely recognized term within the industry. In-flight Radar Control and Immediate Flight Rights are not standard terms or concepts in aviation, making them incorrect choices.