corporate-wage-slave:

Many thanks for your very informative reply. I do hope to be active in this community with several overseas flights on the horizon. One day, I hope to have something to contribute other than questions! Looks as thought 1 of 2 flights out of SEA is the Super J and ours would be. Surprisingly, the flights to INV are about $900 less than flying into EDI or GLA, and even less than flying just to LHR. I hadn't considered Vancouver, but will take a look at that now.