Thoughts: If the US conquer Caroline Island, they can’t land with planes on it. Perhaps they will be supported by British / Anzac ships. But the whole Japanese fleet can attack them in Sz33. And note: Some of the planes from Kiangsi can reach Sz33 and land on AC, because the planes from Sz35 can land in Palau Island or Marianas. If they move to Sz6, please. The Japanese whole fleet with ALL of their planes will destroy them at J4!
Just wanted to point out an error in logic in this step. Primarily, the United States of America does not need to land planes on the Carolines, Australia has 3 fighters and I highly recommend using those planes. That way you instantly get 3 scrambles if you are ever attacked.