Permanently free airports
永久免费(used form a nominal expression)airport
Fully self-researched airports
Free airport
All transit 1x rate airports
The newest Hysteria 2 protocol airport, rarely found on the entire web.
Stabilization of a 4-year old airport
English (Canada) 
Chinese (China) 
English (United States) 
Chinese (Taiwan) 
Japanese 
Chinese (Hong Kong) 
English (UK)