In Manchester, both Od Trafford and the Etihad Stadiums are restricted authorisation zones on the DJI Fly App, you need to send a request via the app to get a code to unlock the zone before you can fly. But the Altitude Angel app shows zero restrictions over these stadiums. Why is this? Why does Altitude Angel allow you think you can go and fly there, only to get there and realise you need an unlock code?