An upcoming mobile MMORPG with aerial combat is revealed to be under development by Caret Games. The game titled Rebirth to the Sky features a full 3D open world! You can take a sneak peak from the trailers below:
https://www.youtube.com/watch?v=CNu27OnGnhM
From the trailer, we could see some familiar Korean MMO elements in term of gameplay and siege PvP content. Beside of the basic ground battles, you can also battle in the air with the wings! Here is a gameplay video if you wanted to know more:
https://www.youtube.com/watch?v=MeWxTo97EQ0&feature=share
The game will release in 2017 according to the trailer, however not much information are revealed by the developer until now.
Source: 2P