SID - Standard Instrument Departure - is sort of like a departure path aircraft need to follow after takeoff
STAR - Standard Terminal Arrival - the same as a sid (kind of), but for arriving aircraft
FSNavigator is an addon flight planner which is a lot more complete than the in-game one and can give you the correct SIDs and STARs for your flight automatically, it's payware tho... but you can download the trial version that'll last for abot 20 uses ;)
the FS2004 planner does not plan SIDs and STARs
