At the moment, i think that the airgame is pretty much unbeatable, at least on veteran. I am at the end of october, and every few day about 3-5 single heavy fighters spawn. Maybe somewhere in between are some useful ships, but the problem with the heavy fighters is that they completely ignore my f-17s, which are also completely incapable of catching them. Thus i have to use MIGs, which due to not being able to barrel-roll always eat a missile to the face. Usually this is not a large problem, eat missile, be at 50%, kill alien, repair. But strangely enough, sometimes the one missile just instantly kills my MIGs. Also, there are so many fighters that i can't catch them all, so i usually miss the interesting ships that actually leave a mission behind, kill 3-4 fighters, and lose a MIG from time to time, and slowly bankrupt myself doing so.
It is also incredibly annoying the alien bases and terror missions ALWAYS spawn out of range of my dropship. Having 2 bases would help with this problem, but i see no way to afford this at all, while still being able to down alien ships.