Planes have recon with support, so it would be best if you could replace all artillery and cavalry with planes. Tanks have a high enough siege value that I am pretty sure just having 1 is enough for 60K. Planes get same support level (600%) as time goes on, later in the game. I play with HPM, so I am not 100% certain if this is true:
Total tank and plane armies sound optimal, but they regain organization slowly if you don't focus on production of them.
