Originally Posted by
superdawg
Even though YVR has pre-clearance the airport of arrival must have Port of Entry status. Alaska Airlines announced YVR-SNA a few years back and never commenced the flights due to this fact.
They did, but found out they couldn't disembark the pax at SNA when they got there. All subsequent flights had a stop at SEA.
See:
http://www.flyertalk.com/forum/showthread.php?t=25773