If these are typical fighter planes, it will probably end up the same as the tanks they now have. They won’t be able to maintain them. Hi-tech stuff requires an extensive supply and repair chain.
They only need to fly one way! What is the Range of a Mig? What could they hit? It would have to be someplace without much anti-air protection—That lets out Damascus and Isreal. What about the Russian ships in Syria? What about Baghdad and the Green Zone? Kurds? Basha?