Taking advantage of the great LHR fares-- both itineraries below confirmed in C/J!
The first one includes time for fun... the other one is an immediate turn-around.
05FEB SFO-LHR UA930 747-400
09FEB LHR-SFO UA931 747-400
21FEB SFO-JFK AA44 767-200
21FEB JFK-LHR AA100 777
22FEB LHR-LAX AA137 777
22FEB LAX-SFO AA1950 MD80