Seriously, you guys need to somehow find a master server file with active players and play the Original Starseige : Tribes. Or what till the game finally gets release through Garage Games and their Instant Action game provider.
I say this as it's a multiplayer game that REVOLVES around jetpacks and their combat.... seriously, most of the time your in a jetpack shooting at other players with chainguns, grenade launchers, mortars, laser rifles, disclaunchers and other fun stuff. In power armor, before power armor on everything was a big deal (also in the age of health kits, not magic healing XD)
Seriously, I recommend it, loads of fun

. Currently free to download legally.