I would venture to guess that he is referring to a right turn out off runway 1. The dashes do it all the time and the Jets will do it if they are super light. I've done it 10 or 12 times over 7 years when we would go to PHL. Our company has come out and said they don't want us doing it since our single engine performance is based on a left turn up the river. Evidently they could pay aerodata a boatload of cash to get data but don't want to. Go figure.