 Before 2011, the LPAF MiG-21s did not fly at all due to reported serviceability issues and of 170 MiG-23s delivered, only 30-50 were believed to be flyable aircraft.Those ratios may have been similar for several other platforms.Also, in the mid-1990s, Libyan air force overhauled and repaired many Syrian Arab Air force Su-24MK fighter bombers, in exchange for overhaul of its own Su-22 bombers by Syrian air force—in an expression of gratitude for this military cooperation, Libyan air force gave to Syrian Arab air force as a gift two of its six Su-24 bombers (one Su-24MK, and its sole Su-24MR, which is a specialized and rare reconnaissance and electronic-warfare variant).