Zone unlocks are far more useful and less troublesome than any Custom Unlocks. Unfortunately, DJI doesn't offer a similar Zone unlock for Altitude Zones around airports without fully unlocking the entire airport NFZ. See if they will offer you a temporary complete unlock of the entire NFZ, based upon your paperwork. That will avoid the artificial NFZ outside your current Custom Unlock within a part of the airport NFZ.Well, in a few minutes I got 1 year of blue zones unlocked.
Let's see when next time I have to unlock a red area.
What I am afraid is about DJI related warnings, I don't trust them because they are not accurate and who knows what's next... I wrote about that.
Thanks for the tip!