By the way, the commas indicate a stopover, I'm no sure if there is a more appropriate way when posting here.
Generally writing it with an 'x' is a connection and either 'o' or nothing is a stop over.
eg: SYD-xNRT-JFK-xDFW-BNE would be Sydney-New York via Tokyo, returning to Brisbane via Dallas. It could also be written as -oJFK-.