Question about Flight Simulator X

I have FSX: Deluxe Edition and I was wondering if you can create a flight plan to multiple cities and "act" like a airlinr pilot by shuttling passengers? Is this actually in the game or provided by add-ons? I've been doing the missions and lessons and was wondering how I can be a commerical airline pilot. I was looking at the Traffic ad-on and Cargo airline by Just Flight. I see Virtual Airlines but those are run by people and am I comparing Virtual Airline correctly by saying they are like "guild's in MMORPG's? I thought virtual airlines is provided in FSX. For example: I wanted to fly passengers from New York to Orlando, then fly to Puerto Rico, back to Orlando then to Aruba. Something like FSX offering you a job as an airline pilot or are these only available in add-ons? Can someone explain virtual airlines or did I explain it correctly? Thank you.....