This always annoys me. The air units are so strong as a single unit, however they can't form corp/army. In MP games people just beeline aerodromes and buy a Bomber (and maybe Fighter, since they're at the same reqs), then his enemies surrounder since bomber bombs up all city defense in 1 Turn, while Fighters bomb up any unit in 1 Turn. The current situation is: A single air unit is too strong compared with land unit (a bomber costs 560, and it bombs with 110 strength, as strong as a rocket artillery army, which cost 1530), a fighter costs 520, and it attacks with 100 ranged strength, stronger than a machine gun army, which cost 1215. however they cannot combine. Shall we reduce combat strength for aircrafts but allow them to form corps/armies? This can also make airports better that we set it to allow you train armies of aircrafts. Currently people just build an aerodrome and buy/ produce aircrafts whatsoever, nobody really care about hanger/airports.