Hi CaptOblivious, The Cityliner appears to run over the old Airport- KeiseiUeno route using the old skyliner rollingstock, but now also stops at Aoto. There are now many different Keisei named trains running between NArita Airport and Aoto at different ticket prices and run times. You can change at Aoto and get then on an Asakusa underground line train to take you into Tokyo ,usually just by crossing the platform. This is quite handy if you stay at a Hotel on the Asakusa line. To make it tricky there were also a couple of trains that go straight through , from the Airport on the Asakusa line. I always check on
www.hyperdia.com first. I have never seen many Western tourists on this asakusa line run into Tokyo from the airport.
cheers....Eisenbahn