SEA LHR and SEA FRA were good ole' PanAm routes.. UAL is still keeping them with the one stop, single flight numbers..
After sep. 11 some of the Express routes were cancelled or scaled back. SEA-BLI was one of the cancelled ones. They still have PSC, GEG, PDX, YVR flights with lower frequencies..
There is no SEA-SFO Sh!ttle flights, even though we still have 9 of them. I have been in SEA for last 6 years only, so people with more history in town can shed brighter light on the subject..