Civ 5 often seemed to be a race to air power. A war between two well matched powers would devolve into pseudo-trench warfare with Gatling guns holding the line and cavalry leading flanking attacks often in vain. Great War Bombers would swoop in and break the stalemate quickly and decisively. So far in 6, I haven't found air power necessary (or strong, given the massive investment needed to get an Air Force to the front lines). It seems that corps and armies are better at breaking though, especially since you keep the promotions from the highest ranking unit when forming a corps or army. So... How good is air power in Civ 6?