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Notice of proposed rulemaking (NPRM).

This action proposes to amend five low altitude Area Navigation (RNAV) routes (T-routes) and establish five T-routes in support of the VHF Omnidirectional Range (VOR) Minimum Operational Network (MON) Program. The purpose is to enhance the efficiency of the National Airspace System (NAS) by transitioning from ground-based navigation aids to a satellite-based navigation system.

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