BBY/ABY is used to position items along the Star Wars Timeline. BBY refers to Before the Battle of Yavin. ABY refers to After the Battle of Yavin. The Battle of Yavin in Episode IV: A New Hope occured in 0 BBY/ABY.
As The Dragon Void race gets more intense… Han's rebel mission gets more deadly! Can the Falcon hold up to one of the most intense flights of its career? What's worse for Han… failing Leia? Or losing a race?