In other open formats, publicly contributed data, the Worldwide Soaring Turnpoint Exchange: Airspace "NGA Invites Public Comment on Proposal to Remove Aeronautical Information from Public Sale and Distribution" (PDF).
Dalam format terbuka lainnya, the Worldwide Soaring Turnpoint Exchange: Airspace merupakan data yang dikontribusi oleh publik. ^ "NGA Invites Public Comment on Proposal to Remove Aeronautical Information from Public Sale and Distribution" (PDF).