I live and fly in Finland where we have an ADIZ border between the Aland Islands and mainland Finland. Aland Islands is a demilitarized area thus the ADIZ border even though it is the same country. This causes some issues as you should have a filed and active flightplan if you cross it.
As we have quite a few floatplanes flying in the archipelago causing some problems when they inadvertently cross the ADIZ border. 

I have not found a way to show the ADIZ border in SkyDemon, would it be possible to add?