They will lose , but will kill a lot of people doing it.
"An air attack was considered successful whether it hit armed rebels or the unarmed civilians that supported him. Several air force defectors reported that pilots were often instructed to go after bakeries (bread is a key element of the Syrian diet) and apartment buildings, in order to maximize the suffering among civilians.
The air force is rapidly disappearing because of combat and operational (accidents and poor maintenance) losses. At this point the government has nothing to lose and simply regards the remaining aircraft as similar to diminishing ammo supplies. Use it or lose it to advancing rebels."