I expect Midway's airfield was about at capacity for the June battle; for example we had eighteen new Avengers of Torpedo 8 detachment on Oahu but only deployed six to Midway. At that point there were about sixty single-engine aircraft, four B-26s, and nineteen B-17s. Using the same numbers and substituting Betty's for the B-26's and B-17's, what was the recon range out of Midway? I would use some of the Betty's for distant recon and single engine for 2nd level recon. The Betty's range would enable it to patrol to Hawaii and beyond it if they wanted too. As far as sub's interdicting supplies, we're are talking about the effectiveness of the subs in December of '41 not December of '43. Look at the effectiveness of the subs on guard duty at Wake Island. They might as well have been tied up at dock in Pearl for all the good that they did. Say they get within 400 miles two hours before dark. I'm guessing here but I assume dark is around 7pm local time and favorable conditions to launch recon is at first light or around 5am local. That means that your ships have to sail undetected into double layer recon for about twelve hours. Where would your ships be at 5am? You have to use a zigzag pattern on your approach and at what speed of advance?