Okay, somebody please explain this one to me. Just took a recent flight from Europe to the US West Coast. When leaving Germany I placed my iPhone in Airplane mode and was never connected to the planes wi-fi system. During the flight I checked my phone of various reasons and each time the phone had the correct time for the current time zone, even while flying over the Arctic Circle. At the same time my Apple Watch showed the current time in Germany where I departed from. Several time's during the flight I took my phone off airplane mode for a few seconds and it immediately updated my watches time also. How exactly does this happen without any internet connection at 35,000 feet over the Arctic Circle or Atlantic Ocean?