Its not exactly a big airport and the existing terminal is very old and cramped, though there is a new terminal under construction that might just have opened by now. Traffic is predominantly China Northern until nearly lunch time, then it gets a bit busier, but then quietens down in the afternoon.
Main operator is Northern, and this is where their MD-90s seem to lurk, but they don't seem to see many A300s, MD-80s or Y-8s. Northern also have a big maintenance hangar on the airport. Other operators are the usual Chinese suspects - Air China (737), CNAC, Wuhan, Southern, Eastern, Great Wall, etc. None-Chinese airlines seemed to be mainly Korean (777), Air Koryo (TU-134), All Nippon (767), JAL (767) and Baikal (TU-154) - no idea on frequencies for these, but I doubt more than once daily.
Only five pictures on the database from Shenyang - I've got alot more than my current two, but haven't had time to scan them yet.