Building highways in the sky requires getting your feet dirty. Luckily, I wore boots the day I accompanied a team from Hughes Aerospace Corp. through the ranchlands of Cisco, a tiny rural town smack dab in the middle of Texas. Today’s job: validating a slate of new performance-based navigation (PBN) procedures that Hughes built for the operators of a new airport in Cisco. At the edge of the Angle R property, adjacent to an approach path, a tree limited the minimum altitude for a ...

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