So the question is : how the fight aircraft/ufo have to be displayed ?
How about a 3D-Battlescape in the air with small aircraft and ufo-models
instead of soldiers and aliens on the ground ?
The map would be mostly empty space (maybe some clouds?), and the
scale would be much bigger (say each square 100x100m instead of 1x1m),
and we could use the familar animations for beams and rockets.
And how many UFOs have to be created in geoscape ?
Are there any missions for the ufos yet (exploration / build base / supply / terror / etc.) ?
Those missions would determine which type of ufos (and how many of them)
were flying from/to which place.
E.g. exploration --> single scout
supply mission --> 1 transport with 1-2 escorts,
etc.
Of course, the AI needs some adjustments for such fights...
If an ufo gets shot down, the game has to create a ground-mission
in suitable terrain.