The Y-wing is perhaps the most versatile of all Rebel starfighters. With slight modifications or different model configurations, this ship is capable o handling virtually any mission. This flexability is a valuable asset to the Rebellion, since they cannot afford to invest in many specialized ships. (The highly specialized A- and B- wing fighters are produced in quite limited numbers.)
The Alliance employs two basic Y-wing models, the BTL-A4 and the BTL-S3. The S3 is the two-man variant. It has superior shields to A4, as well as better accuracy with its ion cannon (directly controlled by the gunner).
The A4 is also known as the Y-wing Longprobe. It is modified for deep-space missions with longer in-flight time. Whereas the S3 has no nav computer for making calculations for hyperspace (it uses a R2 unit with pre-set coordinates instead), the A4 is equipped with a sophisticated model capable of unlimited jumps.
Because of the power drain of its stronger hyperdrive engines, the A4 loses some of its deflector shield strength, though the hull is reinforced to compensate. | 
