VATSim

About

VATSim stands as a massive online network where players act as air traffic controllers for real flights. You talk to pilots via voice chat and guide their aircraft through busy skies using radar screens and flight plans. The system connects thousands of users worldwide so you can manage actual commercial traffic in near real time. It runs on official aviation charts and requires you to follow standard procedures used by professional controllers. The sheer scale of the community sets this apart from other sims since live players generate most of the activity. Users often rate the realism highly because the voice comms are mandatory and match industry standards. You will find yourself managing complex arrival flows while dealing with unexpected weather or emergencies. The learning curve is steep for newcomers, but the site offers training modules to help you get up to speed quickly without any paid software required to join.