I implemented the tactic of sending US transports through the Carolines. It did not work, but I also made some mistakes. After correcting them, the allies won in a duplicatable fashion.
#1 - I had not purchased any extra AA for the brits in prior games. I don’t know why it took so long to occur to me, but it finally did and worked fairly well.
#2 - It also should have occurred to me (because of my prior experience with A&A 1984 and 2004) that the US should be sending fighters to support the UK, just like the US and UK did for Russia in the prior games. The US lost several planes in defense of the UK, but it wasn’t that bad. Further, combined with a bomber, a swarm of the planes can augment a small fleet destined to engage the japanese east indies fleet. This was very successful and got the US in the game. By the time it was obvious the allies had won, there were 6 US fighters, 1 ANZAC and 1 UK fighter creating an impenetrable stack in Burma.
#3 - The Hit & Run strategy previously suggested did work. To be more specific, I had a conveyor belt of ships and equipment passing down from San Francisco to the East Indies/Malaya. Basically, I had duplicate fleets in San Fran, Honolulu, Queensland and Java/Malaya. They were all within one move of each other. No fleet was large enough to mentally warrant pulling Japanese ships away from their posts. The fleets effectively supported each other. If japan converged on/attacked either of the two middle fleets, the two nearby fleets could converge on a destroy whatever was left of the japanese engagement. If the JIN attacked the DEI fleet, it would win. But then another US fleet is immediately ready to move in. I tested this once in the DEI . It seemed worth it for Japan to stop the flow of arms, but then the next turn the US was right back there, supported by the planes that were defending the Burma.
The last technique was especially important because it meant that (with duplicate fleets) you could build in San Fran and move the men and equipment down to the DEI in one turn (via the 1move conveyor belt shuffle). This so far seems the only way to get the US into the fight reliably. I see no obvious way for Japan to counter this, with the exception of going after Australia early. However, that seemed fairly risky for me. In my next attempt, I will have Japan go after it very quickly. Once the conveyor belt gets going, it’s overtly risky to engage it.