Originally Posted by SouthsideJAX

I tried it one time, and had the FA tell me to shut it down. It was not against that particular airlines policy, but I had to go along with her, as she's the boss. It will work, but mine had a hard time picking up the satellites at cruising altitude and speed. It took a while to get a fix. I had to hold it again the window for it to get any kind of signal. I would not want to do that for the whole flight. I don't know if it was accurate, but the Captain said we were riding a 100mph tail wind going from DFW to PHL. The GPS unit indicated we were doing over 640mph. We left an hour late, and still got in on time, so we must have been going faster that usual.