If US decides to build up in HAW seazone, your aircraft are useless for a complete round (or more). Because you can’t fight that seazone (6 spaces). As US player I would just sit tight, build up and move to Japan via a northern route. Or go to Indies via southern route (Australia). Or build up TR with loads of cargo to take out Carolines. For every fighter it costs Japan it costs an inf for US.
And I think it will be a very dull way to play, or am I mistaken?