You are correct that in the above case it will count as a segment but you statement is not true in all cases. If it is a through flight on a single flight number and so long as you do not stop at the intermediate point and you are ticketed through to the final destination it is considered one segment. For example; the QF flight SYD to JFK stops at LAX. You disembark and clear INS and Customs before reboarding. The LAX-JFK leg does not count as a segment if you are ticketed SYD-JFK.