Reducing the number of planes is completely unnecessary. They don't make the game unplayable, any more than they did for the real submarines. I can avoid airplanes all day by spotting them on radar, staying at 9 knots, going to periscope depth as they enter a 5 mile radius, stay under for four minutes, surface and continue as if nothing happened. If a plane will never get within 5 miles of you you don't even need to submerge.
I do this never reducing time compression to less than 8x. It's a non-event.
Now if you allow yourself to be spotted then they gossip on the radio to all their flyboy buddies and you'll have more visitors. Avoid them all. Don't be seen. 48 hours later you'll be back to normal numbers of planes.
Planes aren't a big deal. They don't need to be artificially nerfed. The real submariners couldn't load up the "nerf the planes mod." They would have loved it. You don't need it.
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