pardus is a space themed browser rpg. Not a flight a game, but what it does have is a lot of rpg funcionality. There are 3 factions, the ability to make and join guilds for protection. The ability to be a pirate/ smuggler. The option to place bounties on your enemies. There are also faction wars once in a while. Players can build buildings from low levels to supplement their income and buy better a ship or parts for it. If you're really rich in pardus, you can rent squadrons of fighters for a few days, bear in mind that most people only use a single ship, but with a squadron of fighters following you, you can destroy enemy buildings and raid the wealthy ones.
http://www.pardus.at/
I stopped playing because my guild was controlling everyones prices and it felt like a dictatorship. Otherwise i was tempted to save up for a squadron and go postal.