In principle quite okay, but a bit boring at least in 1 vs 1 due to the large map and the rather slow airplane controls.

I've wanted to make such a scenario for a longer time.
If the bombs turn out to be too slow, make them boompacks...

You could also increase the fire rate of the airplane to have an advantage against the musketeers.

We just played it and it was fun despite a couple of huge bugs %)

The controls feel very unresponsive. I suggest you increase acceleration values. Also, the motor would sometimes go off and not turn on for no reason. Maybe planes should have their BorderBound changed so they can fall off the bottom of the screen when they are dead or have no passenger.

Once my enemy ejected his plane with the emergency balloon and I shot him. After that, the balloon popped and left an increasingly big bubble behind, which would eventually cover the whole map in white. Not sure if this is intended (see screenshot)

This shows promise in the future.

>-Improve rain (Default is not very athmospheric)

I played around with rain the other day, this is how it turned out. You can have it if you want, or not, or just make your own, or whatever you want. :)