Honestly there is no telling where these planes came from. The game literally spawns them out of nowhere there may or may not have been a carrier in the area.
As others have said in the 'stock' game the planes can become incessant.
Probably the best tactic is to run submerged at around 2 knots in daylight hours and run on the surface at night.
Better yet start looking into some of the mods that have been mentioned which tone down the amount of air cover to a reasonable degree.
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