When an object like a jetway or bridge is blocking your aircraft from the rain then no rain should be rendered on the aircraft. Also when a window being blocked by another window rain should not be rendered on the inner window. Here is an example.
Experienced this behavior a few days back when I started my Stearman in the Hangar at EDSA.
So +1 from me.
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It´s the details that count and seperate average from true awesomeness. Voted 
Easy fix if the developer is listening ??
Simply add a small Environment occlusion box that the window “opens into” 
your’e welcome LOL