> Flight information is public information. It needs to be. It’s not optional

Similarly the location of your mobile phone is public information, for technical reasons it has to be. Just like aircraft, your phone constantly broadcasts identifying information for all the world to hear. Additionally, just about anyone anywhere in the world can query the phone network for information about which cell tower your phone is connected to.

I suspect many would not be very happy if there was a twitter account tracking the location of their cell phone.