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Polmar in Aircraft Carriers (p193)states:
"While the Vals were flying towards Hermes and the Trincomalee bombers were refueling on their carriers 9 RAF twin engined Blenheim bombers attacked the carrier Akagi."
From what i've read elsewhere, the Blenheims were actually RCAF and were undetected until after the bombs were falling.
What would be the effect of a successful attack on Akagi and possibly some of the other carriers if more aircraft had been available?