CNN: "Transponder data shows that the autopilot on Germanwings Flight 9525 was reprogrammed by someone in the cockpit to change the plane's altitude from 38,000 feet to 100 feet, according to Flightradar24, a website that tracks aviation data." What? There is no way anyone can see what's been programmed on the FD................
The Mode S transponder can relay a lot of data not shown on FR24...