I could be wrong, but I thought AERO was just an overlay on top of SHARES.
MatthewLAX had an article the other day on how Oscar was doing rounds and speaking to front line employees and what frustrates them most, Aero being one.
Aero is the front-end system United airport staff use to process flights and rebook customers. Many employees have complained about its speed and functionality that hampers the efficiency of handling customers and delays. I can certainly add that it takes a ridiculous amount of time to rebook compared to the old fastair system prior to the Continental merger.
http://liveandletsfly.boardingarea.c...s-gate-agents/