If you are expecting to jump into your power armor, grab the wife and kids, and go visit Aunt Martha in Miami, you are going to be sorely disappointed. Watch that segment again paying close attention at the gauge in the lower right corner. Flight time seems to be tied to Action Points which drop alarmingly fast when "flying". That jet/rocket pack may be used to quickly get to the top of a three-story building or prevent you from creating a red asterisk on the ground in a long drop, but it seems to be more like an aid to jumping than an ability to fly.