A Sea Rescue module has been released for the free Sturmovik Commander WWII air combat rules.
From their announcement:
Today, the ‘Sea Rescue’ module was added to the Sturmovik commander free wargame. This little, cool expansion allows to pick up the downed crews from the sea by flying boats and float-planes. This is the next aspect of WW2 warfare, which is covered probably exclusively by this extremely flexible and playable WW2 air ruleset!