Which RNAV system is based on performance requirements for aircraft operating along an AT route?

The correct answer is PBN, which stands for Performance-Based Navigation. This system is designed to allow aircraft to fly specific flight paths based on a combination of air navigation service and aircraft performance capabilities. It encompasses various RNAV (Area Navigation) and RNP (Required Navigation Performance) systems, establishing a framework for more precise and efficient routing through controlled airspace.

PBN presents a set of performance requirements that pilots and aircraft must meet to operate particular routes, including AT (Air Traffic) routes. This ensures that all participating aircraft can navigate safely and with greater efficiency, substantially improving air traffic management and reducing emissions.

While RNP is a component of Performance-Based Navigation focused specifically on required performance levels, PBN is the broader concept that includes both the framework and specific requirements necessary for navigation along AT routes. This distinction makes PBN the comprehensive answer to the question about RNAV systems related to performance requirements for operating along AT routes.