I didn’t know there was such a thing until Little Navmap gave me an error with a route stating that I was going the wrong direction on a one-way airway.
Is there a way to ensure Charts only uses the correct airway direction? Autogenerating this route: LPPT/02 GANS6N GANSU UN975 RAKUN RAKU1P LPMA/PILIM.R23
UN975 appears to be one-way towards the island.