Why are all my planes only using one runway to take off in IAD? Is it possible to control what runway they use?
Not this update I think it always meant to take off using one runway even for 2.0-3.0
most of your stands are located on those 2 middle terminals, according to the IAD - Wiki those planes will only use that runway for takeoff. It is also possible to see, at least 2 planes, that are going to take off on the “southern” runway cause they most probably came from the terminal on the right side.
I recommend that you take a look at the IAD Wiki
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Understood. When I had less stands it seemed like the planes used more runways to take off. Thanks for the advice with IAD wiki.
Can’t help but notice that long ID 
lol, that’s my self generated Apple gamer ID.