Yorktown's radar was able to give the ship ample warning of an incoming attack, and were thus able to either get planes aloft or get them secured. In fact, most of the prepped SBD's were immediately ordered aloft by the captain, and only a handful (I think it might even be only one) fully loaded SBD was in the hangar. Additionally, fueling equipment, extra ordnance, and extra equipment would have been stowed as the carrier braced for combat.she kind of did though. There was a least 1 squadron of SBD's fully fueled and armed in her hanger deck which were hit and caught fire. The other difference was that the fire prevention systems were much better on US carriers (Akagi's was knocked out by a near miss.)
That's a very different proposition from what amounted fully loaded deck spot (which for the Japanese carriers at Midway was anywhere from 25-35 planes per carrier) and the recently recovered, battle-damaged planes from the strike on Midway.
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