it's one of the delta.com front pages ... "2 days of London deals"
we have a 2-week trip in mid July; I've been holding 2x SEA-LHR//LHR-SLC-SEA at 142.5k for a couple months ... not sure we want to spend $3502 apiece (although we could change the return to LHR-MSP-SEA which is a much better arrival time)