Jan 20 (Reuters) - Sydney Airport Holdings Ltd SYD.AX :
* Asx alert-sydney airport traffic performance december 2016-syd.ax
* 2016 international passenger growth of 8.9%
* In December, international passenger growth was 7.2% compared to prior corresponding period
* Dec domestic passenger numbers were 1.0% above pcp for month
* Aircraft upgauge for airline's seoul service will take effect in september 2017
* Result for december was driven by domestic load factor improvements and larger aircraft during peak holiday period Source text for Eikon: Further company coverage: SYD.AX