Flying Lufthansa you can access a flight information JSON-API via their on-board WiFi at http://map.boardconnect.aero/api/flightdata

gistfile1.json

{
    "lon": 6.894092559814453,
    "lat": 50.272064208984375,
    "groundSpeed": 499.7942175120898,
    "heading": 108.9605,
    "orig": {
        "lon": -0.461389,
        "lat": 51.4775,
        "code": "LHR"
    },
    "dest": {
        "lon": 11.786086,
        "lat": 48.353783,
        "code": "MUC"
    },
    "eta": "19:51",
    "timeDest": "00:26:41.9250000",
    "distDest": 223.3586610384782,
    "altitude": 36828,
    "temperature": -55.25,
    "clearRoute": false,
    "displayProjectedPath": true,
    "utc": "2015-05-01T18:25:08",
    "displayPA": false,
    "arincAvailable": true
}