Not a rumor. It was a rumor for the last few months, but was confirmed yesterday.
They confirmed most of the tech systems across all the divisions from bag processing, reservations, gate processing, sales, revenue management, HR, crew scheduling...
A hodgepodge of systems from both. Truly a "merger of equals".
I would HATE to work on the IT integration team the next year or so...looks like some MAJOR headaches for some techies.
"GG" has been dead since fastair came out like 13ish years ago, unless you worked in some backend support offices. UA has used a GUI based system that automates all the "GG" and other cs/res functions since then (1st was fastres for reservations, then was fastair for airport CS.)