r/VATSIM

Virtual Air Traffic Simulation Network

VATSIM (Virtual Air Traffic Simulation Network) is the go-to online flight simulation network, where virtual pilots can connect their flight simulators to a shared network and enjoy realistic communication and procedures by VATSIM's trained virtual Air Traffic Controllers. Since founded in 2001, VATSIM has built up a community of over 180,000 active users, making it the largest online flight simulator community.

r/VATSIM is a SFW subreddit with 22 thousand subscribers, created in 2011.