you can have your pilot career, buy and sell planes, make flights to earn money, screw up to lose some

you can hear the passengers boarding your aircraft and the crew announcements, you have to mind how satisfied your passengers are and serve them food and drinks to keep them happy
it gives purpose to the FS experience, now you're flying for a reason

it costs about 20 euro, but theres a fully working demo available for D/L (it limits you to takeoff only from KSFO, land anywhere)
i just tried my first flight with it, was surprised to see the passengers getting more and more scared on the takeoff run... seems i forgot to secure the cabin door

this addon integrates seamlessly with FS, you don't have to leave it running on the background because it places itself as a new drop-down menu when you press alt, so you can manage your career and flights without even having to pause the game
amazing really... you haven't played FS until you've played it with this
(http://www.fspassengers.com)
c ya
Moach