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[http://en.wikipedia.org/wiki/Instrument_flight_rules '''IFR'''] are applicable when [[VFR]] is not allowed. The weather or meteorological conditions when [[IFR]] is required is defined in [http://en.wikipedia.org/wiki/Instrument_meteorological_conditions Instrument meteorological conditions ('''IMC''')]. Navigation is based on [[radio beacons]] and most often a pre-approved flight plan is required. The pilot must be certified to apply IFR. All scheduled commercial flights operate exclusively under IFR. | [http://en.wikipedia.org/wiki/Instrument_flight_rules '''IFR'''] are applicable when [[VFR]] is not allowed. The weather or meteorological conditions when [[IFR]] is required is defined in [http://en.wikipedia.org/wiki/Instrument_meteorological_conditions Instrument meteorological conditions ('''IMC''')]. Navigation is based on [[radio beacons]] and most often a pre-approved flight plan is required. The pilot must be certified to apply IFR. All scheduled commercial flights operate exclusively under IFR. | ||
==External articles== | |||
*http://en.wikipedia.org/wiki/Freedoms_of_the_air | |||
==To do== | ==To do== | ||
*Formatting | *Formatting | ||
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