The 117.900 MHz group logo.
The 117.900 MHz Group is a Second Life group dedicated to the role-play of air traffic control (ATC). The group covers the Sansara and Heterocera Atoll continents and uses dedicated ATC bots to communicate with pilots and simulate real-world ATC chatter.
Pilots can search for and join the 117.900 Group in-world, like any other Second Life group. However, to communicate over its "group chat" pilots must first contact one of the ATM officers (listed in the group) and be granted the "pilot" role. Once authorized, pilots can then interact with the various ATC towers (manned by bots) in-world; submitting flight plans and requesting access to various ATC services. See the ATC bot article for full details on how to interact with ATC bots.