Organising a Play-By-Post game of Frozen Skies has prompted thought over how to handle aerial combat in this medium. Theatre of the mind's eye I feel wouldn't work as well as I feel things would get too confusing with positioning. So some sort of map seems the best option, but again that has it limitations. Fortunately I think I found a decent compromise for what I'm looking for.
http://www.utherwaldpress.com/2019/06/aerial-hexfight.html
That seems a decent system :) I guess one of the limitations is that all craft have to be assumed to be at pretty similar height for the logic of a 2d hex grid to work? Unless you have several layers, but then distances for attacking from one layer to another get complex.