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There is a long history of SF novels about interstellar free traders eking out a marginal existence on the fringes of the huge trader corporations, from Andre Norton's Solar Queen novels to the Space Angel series by John Maddox Roberts.Go to The Tough Guide to the Known Galaxy and read the entries "ECONOMY", "FREE TRADERS", "PIRACY", "REPLICATOR", "TRADE" and "TRADE FEDERATION".
That is, selling price at destination MINUS purchase price at origin must be 0,000 or more.
Don't forget the entry in this website about Cargo Holds As mentioned below, if you want to play around with interstellar trading, or even try doing a full simulation (to do worldbuilding for creating the background of your new novel), I'd suggest getting a copy of GURPS Traveller: Far Trader.
Written with help from a real live economist, this allows one to model interplanetary and interstellar trade with equations and everything.
They go fast, can carry lots of people and cargo, and are the most advanced technology that can be massed produced.
The ticket prices will not be similar between airliners and starships because FTL interstellar travel will probably take more than a few hours for the trip.