<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Do you have to travel to the eastern US anytime, for instance? Even a YVR-DFW-BOS-DFW-YVR for example will get you the 4 required segments...
FewMiles..
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That would require a lot of upgrade stickers !! and the fare ex-YVR is a bit high.
I prefer to do some segments that are under 500 miles each if possible :-)