Air Serbia, which is partly owned by Etihad Airways and that used Etihad Guest as its frequent flier program, is beginning (or resuming) flights between New York and Belgrade on June 23, 2016.
Etihad Guest members can earn double miles for economy and triple for business class for flights between June 23 – July 23, 2016, that are booked by March 19.
You can access Etihad Guest here.
Note that there doesn’t appear to be requirement to sign up for this offer. It should be open for all.
Here’s the Air Serbia’s flight schedule:
I actually flew on Air Serbia last July from Sarajevo to Zagreb with a four day stopover in Belgrade. Nice airline and all the Etihad Guest benefits provided including lounge access.
This opens up one more way to earn and burn Etihad Guest miles for flights between Europe and New York.