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...Flight management systems have evolved to a level of sophistication that helps crews fly commercial airplanes more safely and efficiently aero quarterly qtr contribution performance based navigation fms associated airplane are the primary tools on board today s evolution these has led way for pbn u federal aviation administration faa next generation air transportation system by sam miller associate technical fellow deck crew operations is concept used describe naviga made possible largely aviators coast across tion along route procedure advances in capabilities united states however early flights or airspace within bounds which this article operators better were filled with uncertainties their use must operate transport understand how other visual rules soon gave it typically specified terms over reliable attitude indicators ground required rnp time they contribute opera aids navaids non defines tions plans further advancement directional radio beacons accuracy integrity airborne autom...