What reinforcement did Pearl Harbor need most?

What reinforcement did Pearl Harbor need most?

With more scout aircraft and trained reconnaissance capacity, because detecting the approaching carrier force was the most important missing capability.

Scout aircraft were the most important reinforcement for Pearl Harbor. More Catalinas, trained crews, and sustainable patrol capacity would have expanded the narrow search sector available to Kimmel. Earlier detection would not predetermine the battle, but it would give commanders time to sortie ships, disperse aircraft, and coordinate a response. Information-gathering capacity was a combat capability in its own right.