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.
The Youtini Expanded Universe Ranking system is a 1-5 scale that ranks EU book quality, difficulty, and importance. Books closer to Level 1 are easier to read and understand, more important, and of higher quality.
From New York Times best-selling author Elizabeth Wein (Code Name Verity, Rose Under Fire), this middle-grade novel is all about the pilots and technicians of the Resistance's very own Cobalt Squadron. New characters from The Last Jedi, including mechanic Rose Tico and her gunner sister Paige, get the chance to shine in this hardcover adventure.