Tried the 566.36 driver now and I think it does better, so big thanks for that tip!
I also realized I made another mistake to add passengers into the airplane. As someone else mentioned in above. In a 747 there is room for quite many passengers and it seems they totally destroyed the frame rate. But strangely, only when looking in certain directions, and from the cockpit as well, where you cant see them anyway?!, another indications that these stutters doesnt need to be there, so to say 
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I have a 16GB AMD card and play @1440p