What does IFR stand for in aviation terminology?

In aviation terminology, IFR stands for Instrument Flight Rules. This set of regulations governs the operation of aircraft in weather conditions where pilots must rely on instruments for navigation and control rather than visual references. IFR allows pilots to fly in a variety of weather conditions, providing a structured framework for communications, flight procedures, and the use of airspace.

Using IFR is crucial for ensuring safety during flight, particularly when visibility is low due to factors like fog, rain, or clouds. It involves specific training, procedures, and air traffic control instructions intended to guide pilots in their navigation, approach, and landing.

The other options do not accurately represent the commonly understood definition of IFR in aviation. For instance, while "International Flight Regulations" and "Integrated Flight Regulation" might suggest similar concepts, they are not established terms within the aviation community. "Intended Flight Route" might refer to a flight plan or path, but it does not encapsulate the regulatory framework associated with instrument flight operations.