Originally Posted by
mnscout
Next month I'm flying the following route: JFK-LIM-EWR by United (with LIM-IPC-LIM by LAN thrown in for good measure, but that's irrelevant

). And I added a one way to San Diego at the end of my trip. My itinerary is as follows:
JFK-PTY-LIM by Copa (in couch)
LIM-YYZ (biz)- EWR (couch)
EWR-SAN (coach for now due to no F availability, but I will wait, until there is

).
The reason why I was able to add San Diego is that I was careful NOT to fly by United that has Houston as a gateway city. My NA gateway city is New York. So I was able to add this one way to SAN for free (I could almost hear the Untied CSR scratching his head in disbelief

). And if you take business or first, your add on is also in business/first and you can change the dates with no additional fees. Hope it helps.
Actually, your North American gateway is YYZ

.
The North American gateway city stopover rule is for American, not United. United allows a stopover
anywhere as long as you book a round-trip. Round-trips can have 2 open jaws, and you had 1 (JFK-LIM, LIM-SAN, with a stopover in EWR).
A better example would be flying LIM-JFK(stop)-LAX-SAN on LAN/AA, and not flying via MIA, because then you'd have to take the stopover in MIA.