United MileagePlus members can earn up to 100,000 bonus miles when flying between Chicago and Shanghai through Dec. 6, 2014. The bonus miles accumulate for up to four roundtrip flights during the promotion. If you fly one roundtrip in United Global First or United BusinessFirst (F, A, J, C, D, Z, P), you will earn 25,000 bonus miles; flying one roundtrip in economy (Y, B, M, E, U, H, Q, V) will net you 10,000 bonus miles and one roundtrip in economy (W, S, T, L) will net you 5,000 bonus miles, up to 20,000 bonus miles if you fly four times. Members must register prior to travel and travel from Chicago (ORD) to Shanghai, China (PVG) on flights operated by United. Visit http://insideflyerus.wpengine.com/link/?11646 to register for the promotion.

Bottom line: Members should pay close attention to the fine print that states, “Circle trips, multi-city itineraries and itineraries with stopovers do not qualify for this offer.” United is mirroring a bonus from American AAdvantage that also runs until Dec. 6, 2014, where AAdvantage members can earn up to 100,000 bonus miles for nonstop roundtrip flights between Dallas/Fort Worth and Hong Kong or Shanghai or between Chicago (ORD) and Shanghai. Visit http://insideflyerus.wpengine.com/link/?11647 to register for the AAdvantage bonus.