We know aang mastered 35th tiers of airbending at age 10 ( it is confrimed when he was 10 he had proven himself better than his own teachers)

and invented the air scooter at age 12

He had to go to the eastern air temple to learn the 36th tier but he didn’t

I used to think the Spiritual projection is the 36th tier but It is definitely not,cause most airbending masters can’t do it aside from aang and jinora and they all have tattoos

In “imprisoned” episode Aang said " I wish I knew how to much a hurricane “

We saw only yangchen made a hurricane in “the avatar state” episode

So i guess hurricane is the 36th tier of airbending

Or maybe only the airbender avatars have the right to learn this technique?

Any thoughts?