It all comes to the quality of the airframes. Japan can stock on middle war airframes in the pools, and the likes of George/Frank-a/Zero A6M5x/Tojos may never run out indeed. However, it is not possible to produce a healthy stock of later war airframes because Japan just doesn't have enough time between the moment research ends and the heat starts. And it is those planes (Sam/Frank-r/Ki-83/Shinden) that are the most competitive in the air. Bombing those factories is essential for reducing Japan's CAP strength.ORIGINAL: crsutton
I think you will find that as long as supply has flowed into the economy, the Japanese player can produce aircraft and never run short. Pilots do not seem to be an issue either. My last campaign concluded on 8/45 with my opponents pools full of aircraft and high quality pilots. But I played to shut of his oil and he had nothing left as far as supply goes. If you did not cut off the flow of supple from the DEI, you are still going to win, but you will just have to do some more grinding to get there.
If Japan had unlimited supply for repairs, bombing out a 30-size factory would prevent the production of ~15 airframes cumulatively and the factory would've been back online in a month. But Japan does not have that supply in 45, and usually chooses to not repair in the view of future bombings. This means minus 30 modern planes a month forever. With the scale of late war air battles, it can add up real quick
P.S. Also, in my favourite AAR of all times Nemo scolded GreyJoy exactly for that - not concentrating his 4Es against Rader's fighter factories [:D]

















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