All existing map styles are OK for air-to-air, IMHO.
However, for GVs, things are not so good. Any new map should have a dedicated TT for GV-versus-GV combat, for those who want it. Two good examples of this are Trinity TT with an additional VBase added in the center, Ndisles TT, and OzKansas TT. CraterMA TT has some good points, but is too symmetrical, and the high cliffs and lakes channel combat excessively into head-to-head. Also, the surrounding mountains are only 13K, and this does not adequately deter griefers.
At least one base for each country in a TT should not be capturable. TTs should probably not have air bases; there are plenty of opportunities for the ground attack guys on the remaining 95% of the map. True that Ndisles and OzKansas have air bases at the edges, but I think they work in spite of, rather than because of these air bases. Drives from spawn points to fights should not be too long. Alternative spawn points are good, in case one is camped. Terrain should have a lot of moderate-scaled hills, valleys, gullies, etc. to maneuver over (as in Ozkansas), and avoid terrain consisting solely dead-flat plains with clumps of trees.
MH