If you run out of "fuel" in game, and you need a Fuel Rat to come rescue you, you do it in IRC. Dispatch talks to you in their IRC channel, other dispatchers are communicating in NOTAM[2] like notation with pilots out 'rescuing' other players.
It's amazing to behold.
[1] https://confluence.fuelrats.com/display/FRKB/Rescue+Standard...
[2] https://en.wikipedia.org/wiki/NOTAM
Disclosure: Fuel Rat 2010-2013, Retired.