The J35XS was part of a deal between Finland and Sweden so that the last one could provide Finland with different variants of the J35 Draken. At the beginning only second hand J35Fs, Bs and Cs were provided with minor modifications but Finland requested an upgrade variant of the J35F, more comparable to the J35J standard. Thus the J35XS was conceived, it had better countermeasures, electronics, a better radar (but still very similar), more weapon pylons and access to the RB-27 and RB-28 missiles, as well as the RB24J (AIM-9P). A total of 12 aircraft were produced of this variant, and was the only one assembled in Finland, while the kits were produced in Sweden by SAAB. In real life, the J35XS was also able to fire the Soviet R-13M1 (export variant of the R-13M) that was extensively used by Finland in their MiG-21s.

Introduced in Update "Apex Predators", the J35XS plays like all Drakens, fast and with good AoA capabilities. Of course, while doing manoeuvres it loses all of its speed, but it has a very interesting double delta wing design, that allows the aircraft to retain energy at high speeds at the cost of agility. It has access to 6 x RB24Js which are just AIM-9Ps. This missile has a decent range and acceleration, as well as 20Gs of pull. While these don't get you consistent destructions, they still perform decently when launched at unaware opponents. It also has access to 12 countermeasures, not a lot, however being deployed 1 by 1, they can last for a good time and while being better than nothing, they are ultimately sub-optimal at best. This means that taking chaff is not recommended, and thus flying close to the ground to avoid radar locks is highly advised. Also, it uses an IRST coupled with its radar. This allows to lock to the heat signature of jets and slaving the missile to that lock, but the locked target wont receive a warning unlike radar, that triggers the RWR if it's able to detect the lock. The problem is that IRST can't identify if the lock is friend or enemy, so watch out for friendly fire.