I did a couple of trips on the LHR LAX route. June 74 was via Ottawa on G-AXGW 707-336
and November 74 via Calgary on G-ASZF 707-336. Cabin crew changed there but flight deck crews carried on to LA-due to union rules etc.
The other LAX route was the 591 service London/JFK/LAX and on to HNL and beyond -at that time they were always on the VC.10