Edit by Timy Dutton
JT, Julian, Mike Jon and Andy needed to prepare for flying in Chicago. Not only were they practicing flying their wingsuits close to each other and the mountain, but also opening their parachutes close to each other and below 400ft above ground level, and then flying all at once to a designated landing area. The deployment and landing areas in the city were tight, so the guys practice all elements in Switzerland, an environment where they often had some extra safety margin. Then when they went to the city, instead of flying past a specific point on a mountain, it was now a window, or AC vent or other reference point on a building. Looks like they had some fun during the training process.
