Originally Posted by
jiejie

Not sure what point you are trying to make. Any way you slice it, if one's destination is Nanjing city, then it's easier/quicker to get there from Nanjing South Rail Station than from Nanjing Airport. And if coming by air or high-speed rail G train from Beijing, those are the choices. If the OP's colleague wants to change to PVG, he might still have an overnight (somewhere near Hongqiao), but
could get a bullet G train heading for Nanjing Main which is definitely in central city.
This idea did cross my mind (I think there G trains from Shanghai Stn to Nanjing Stn, as well). However, upon further reflection, NJ South is admittedly a nicer place than NJ Station. In any event, I'm liking this fly in from NRT more and more; I've had good luck getting airlines to comp hotels on forced overnights there, and Narita is an okay enough place to spend an evening.