Many air players would indeed say that by day 30 the game is finished and it has been a week since the last active player is deadOn a day 30 a 5 city county could easily have 10+ squadrons of 4+1 (SF+ASF) and probably at least 1 helicopter squadron to deal with SAM if every SAM is stacked.
All maxed ofc. With lvl 5 hospital.
But the key is if that player is successful in expansion. Approximately 3 new cities per day.
Those numbers of planes and helicopters are terrified and very hard to defend if you don't have a lot of ASF and SAM.
6 SAM is a joke. You don't have your fancy "doom stack" or any production building in your cities anymore with 6 SAM.
Ofc a smart player wouldn't neglect AA, missiles and some TD as well even if he is air focused. Or arty at that point.
Also a player who is air focused would attack you way sooner than day 30.
But hey, believe what you want, even that you can neglect arty and air completely.