BTL-B Y-wing starfighter 

Unlike the BTL-S3 Y-wing and its successor designs, the BTL-B model had a full covering of both the primary fuselage and engines. A bubble-turret provided clear view for the gunner.

The BTL-B was designed as a bomber, using such weapons as proton bombs. The bubble-turret utilized two light ion cannons for defense against enemy starfighters. It also was equipped with two medium laser cannons mounted on the front of the starfighter.

They possessed a hyperdrive system allowing them to jump into hyperspace without the reliance on a carrier or hyperspace ring. To aid them in their operations, they also made use of an astromech droid.

"Finding a sole Y-wing bomber in working order, Ahsoka throws Rex onto the ship and attempts to leap on herself but the ship and Ahsoka fall out of the bay. Rex gains control of the ship and sees Ahsoka falling alongside him. She bounces off the falling wreckage and manages to grab on to the opened gunner's seat, pulling herself in. As the stricken capital ship sinks below the clouds, Ahsoka stares into the sky."