Funny that none of the GREE Mods dane to respond to this question.
1. The Advance Typhoon aircraft appears unlocked.
2. When I click on it, I'm presented with options to purchase 1, 10, 20, 50 or 100 units.
3. When I attempt a purchase, I get an error message
When I attempt to purchase aircraft that are "locked" and indicate the required rank, they simply don't open...
SO GREE... WTF?