Under the deal, Aegean will commence four flights each week between Athens and Abu Dhabi beginning M

Under the deal, Aegean will commence four flights each week between Athens and Abu Dhabi beginning March 30th, 2014, with each service carrying Etihad Airways' EY flight code so that it's bookable via Etihad.
Aegean Airlines spokane washington hotels also plans to place its A3 flight code on Etihad Airways-operated flights from Abu Dhabi to Sydney, Melbourne and Perth (along with Etihad services to Athens, Bahrain, Johannesburg and Kuwait).
"By partnering with Etihad Airways, Aegean gains access to the Gulf region and South Africa as well increasing connection opportunities to Australia" said Dimitris Gerogiannis, Aegean Airlines Managing Director.
One prized perk of the Etihad-Aegean partnership, and Aegean's planned codesharing spokane washington hotels on Etihad's Australian flights, is that it could give Australian travellers a greater chance to catapult themselves to prized spokane washington hotels Gold status with Star Alliance .
I do question whether in fact you'll earn any points on Aegean coded, Etihad operated flights, given that this is only a codesharing deal. Though this wouldn't be totally unsurprising to me considering the way in which they operate their frequent flyer programme.