Microsoft is removing the Twin Towers from future (and present?) versions of Flight Simulator. I myself haven’t played Flight Simulator since the late 80’s (version 1.0, on our 8088 PC-XT), and I readily admit that back then, I crashed planes of all sorts (from a single-engine Cessna to an F-18 Hornet) into Sears Tower, the Empire State Building, the Statue of Liberty, and yes, the World Trade Center (often in attempts to fly between them).
I promise: I won’t do it again.