I used to fly for Horizon Air out here in the Northwest and Seattle just started these approaches, RNAV (RNP) M, though SEA hates doing RNAV stuff so unfortunately it's not too common there. In testing though, Horizon was the first to perform this type of approach alongside an Alaska 737.
Growing up and starting my first job in the Midwest, we rarely used RNAV approaches at American Eagle (Envoy) but when I went to Horizon, they would actually prefer us to use GPS based approaches instead of ground based if they were available. The RNP stuff is really cool and I enjoyed flying those approaches, especially ones with curved RF legs. It's pretty amazing to sit there and watch the plane do its thing on RNP .1 approaches down a mountain valley in the weather.
Sean Wood
