What are the Russians hiding in Syria? Aviation quota part [ANALYZA]

In fresh weeks after the fall of Bashar al-Assad's government, much has been said about the impending evacuation of Russians from Syria. While it is easy to measure the naval forces in the vicinity of the Tartus naval base, the assessment of the aviation possible of the Russian contingent stationed in the Humajmi base seems difficult. What precisely do the Russians have there now?