You need heat-seeking MANPADS. That's the biggest thing that has prevented I think a real balance of power in this conflict. As many have pointed out, the fear is that they will be used against commercial planes. That's why none of the western powers are giving them.
Now, the Saudis have recently said that they may change their mind on that. As to whether or not that was a leak to the media, as of Thursday or Friday I think it was, in order to get things kind of pushing and moving at the Security Council, maybe; the point is that they don't have the same kind of weaponry that the Syrian army does.