The heavy X-wing starfighter, also referred to as the advanced X-wing fighter, represented a robust iteration of the T-65 X-wing starfighter. Its creation stemmed from the achievements of the Heavy '95.
Engineers loyal to the Rebel Alliance conceived the Advanced X-wing. Constrained by limited resources, they embraced a philosophy of maximizing output with minimal input, showcasing their ingenuity. This resourcefulness led Rebel engineers to prioritize subtle yet impactful enhancements to their fighters.
The triumph of the Heavy '95, a heavy modification of the Z-95 Headhunter, significantly influenced the Advanced X-wing's development. Engineers understood the benefits of broader hulls for enhancing starship performance. Consequently, the Advanced X-wing incorporated hull modifications akin to those found on the Heavy '95 before the finalization of the fighter's design. These enhancements, including improved heat management and greater mass capacity, rendered the Advanced X-wing a more desirable choice for X-wing pilots.
Following the Battle of Yavin, the Rebel pilots were given some advanced X-wing starfighters as a reward for their duties. They escorted and protected representatives from the Civilian Protection Guild on Kashyyyk.
During the time of the New Republic, a squadron utilizing advanced X-wings played a role in the Liberation of Coruscant which took place in 7 ABY.