Southwest Airlines has equipped most of its aircraft, and trained their crews, but says utilization of fuel-saving required navigation performance (RNP) approach procedures is “remarkably low.” “There are a multitude of reasons,” says Dave Newton, senior manager for NextGen/airspace, speaking today at the RTCA Symposium in Washington. The primary reason for the low use rate is that “pilots stopped asking [to use RNP] after being told ‘no’ a couple of times” by air traffic ...

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