Finding the departure gate of any flight in real time is not a big deal, however arrival gates are more tricky. I checked at least four airport websites, and none of them provides such details. Is there a general way to obtain such information? I don't need real-time information, some recent historic data should be perfectly sufficient.
Of course, I understand that gates change all the time, especially for arrivals, but I'd like to have a ballpark idea where the arrival gate would be -- most airports have separate gate groups for domestic, Schengen and international flights, and these tend to be bunched together, so going from one to another takes no time at all. However, transferring between different gate groups might take significant time on some airports.
As to why I need it -- my girlfriend and myself are flying from different locations to the same destination with a small time interval within our flights, and I'd like to surprise her right after she passes border control.
Finally, if no general information is available, information about arrival gates on Vienna International Airport (VIE) is enough.