Somewhere in the a Options menu you can increase the number of planes and ships you want to see at an airport or waterway, also you can choose Live Traffic by clicking in the weather window, top right at the beguining of your flight setup. I get a lot a traffic when I fly, it takes some of your fps, be aware, I have had to wait in the pattern because of traffic, I had to wait at a cross point because of traffic in the runway, etc., you also see AI planes. You also need a good internet connection. Remember to use ATC.
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