Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Instrument flight rules are regulations and procedures for flying aircraft by referring only to the aircraft instrument panel for navigation. Even if nothing can be seen outside the cockpit windows, an IFR-rated pilot can fly while looking only at the instrument panel. An IFR-rated pilot can also be authorized to fly through clouds, using Air Traffic Control procedures designed to maintain separation from other aircraft. Training is normally done in simulated IFR conditions with training aids such as blockalls to help a pilot concentrate only on the instrument panel.Most scheduled airline flights operate under IFR.[citation needed] Visual Flight Rules are often used for sight-seeing flights, aerial photography, or lift services for parachute jumping. Pilots flying under VFR are not permitted to fly through clouds. Many non-commercial, private recreational aircraft also operate under VFR whenever the sky is clear.

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