Originally Posted by
Kanada goose
These fares are available from the west coast too, Seattle, Portland, etc. The irony is that the Seattle flight is about $300 cheaper than the same itin out of YVR, but if you book on the Seattle flight, you may go SEA-YVR-LHR.

Dare I say, west coast too? This is a regular occurance and as I noted in my original post, has been discussed a few thousand times here on FT. YOU HAVE NOT DISCOVERED THE WHEEL...NOR IS THIS A SPECIAL SALE. If you fly from the UK to anyplace, European carriers will charge less than BA if you transit through their airports. If you fly BA via LHR, its fares will undercut those of those same European carriers. So too does this happen with AC if you fly through YVR or YYZ or YUL overseas from the USA. THIS IS THE OLDEST FARE ANOMOLY GOING!!!!!!!!!!