Hello.
Why couldn't the japanesse invade Aust without invading New Guinea or Timor (perhaps you forget the battle of the Coral sea, when the USA saved the world from imperialism well someone elses imperialism anyway), And if you dont think America is Imperialistic look at Cokacola and Macdonalds, just because they dont carry guns dosnt mean they arnt imperialistic.
RIGHT sorry about the rant.
Back to topic - the ALLIES jumped over japanesse islands to get to japan so why couldn't traveler ships do the same.
ONE small problem i can see FIGHTERS in traveler arn't anywhere near as powerful as in WW2 so carrier wars wont work.
Bye.