The BTL Y-wing starfighter, built by Koensayr Manufacturing, was a mainstay of the Alliance Starfighter Corps. It was often used as an assault craft to attack enemy capital ships directly in conjunction with A-wing starfighters.
Known as a "wishbone" to Rebel Alliance and New Republic pilots, the Y-wing starfighter carried two laser cannons, two ion cannons, and two proton torpedo launchers. An astromech droid, such as an R2 unit(by Marian), could be plugged into a socket in the craft to act as a co-pilot.
The Y-wing was a resilient, well-shielded craft, but was slow and ungainly compared to other Alliance fighters. Its deficiencies were partly compensated for by the heavy proton torpedo load it could carry, and its ability to paralyze craft with ion cannon fire without destroying them, unique until the B-wing starfighter was introduced after the Battle of Yavin. In addition to the Rebel Alliance, many planetary defense forces, mercenaries, and pirates fielded the craft.