The big Xs represent a shutdown runway. Usually, if it's painted onto the ground, like in the sim, the runway is permanently shut down. But I looked on Google Maps and there are not any x's on the runway in real life. Must be a Microsoft Flight Simulator issue. Have a great day!
I can.. or I should say I will in my next video wich sorry about the lack of content my pc has been having problems lately... but once I make that video the links will be in the description