Besides, there were three aircraft carriers some where which could suddenly re-appear and cause some severe damage…

T.A.'s right. But I have to add that an invasion of the Hawaiian isles was also not possible because the difference of thinking between the Japanese Navy and Army High Command. The Army wanted to turn into China and finish actions there. The Navy realised that the US had to be isolated and put against the wall before attempting anything.

There were plans to invade Hawaii, but there was no co-operation between Army and Navy and as T.A. states, Hawaii was heavily defended.

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"War is less costly than servitude, the choice is always between Verdun and Dachau." - Jean Dutourd, French veteran of both world wars

"A mon fils: depuis que tes yeux sont fermes les miens n’ont cessé de pleurir." - Mère française, Verdun