If memory serves, they have code-share agreement with EY.
indeed but as you can see here, they mention that A3 operates from terminal 1.
EY operates few flights from this terminal (most are from T3), and the EY flight to ATH depart from T3.
This is why I was wondering.
As I remember A3 few years ago was operating 4 flights a week to abu Dhabi ( was A3 943) but has been removed. Was wondering is this flight is back (from T1).