About 124thATC 124thATC v2 is a free plugin for X-Plane 10 and 11 that emulates ATC and AI traffic control. It is developed by Antonello Matacchieri and based on Helicharly 2009 project. It has been completely rewritten adding a lot of new features and X-Plane 10/11 full support. It's compatible with Linux, Mac and Windows Operating System 124thATCv2 is and will always be free. If you like it, consider to make a donation