It doesn't but its codeshare partner ATA does go to Mexico.
I don't think Southwest is updating its reservation system right now for anything more than the test of reserved seating for flights from San Diego.
Reserved seating on Southwest is a TERRIBLE idea. The open seating works, don't fix it (and I've told Southwest that, too, as have many people at the Southwest blog have said).
David R
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Post by Mark Panitzsomeone posted
Southwest is already updating its computerized
?>reservation system to
handle assigned seating and international flights
where southwest fly that is international?