'Telling Siri to "Ask Wolfram what flights are overhead" produces the correct results. That query displays a Wolfram Alpha printout showing the flight or aircraft registration number of flights that are currently visible from where you're standing, their altitude, and the angle above the horizon.'
Der ganze Artikel steht bei TUAW
P.S.: Lieber Weihnachtsmann. Du erinnerst dich, dass ich noch so ein gaaanz altes iPhone habe?
