You learn something new every day!
I had absolutely no idea that -436s flew non-stop on West Coast routes early in the '60s. I had assumed that because a decade later Los Angeles was served via New York that this had always been the case.
Does anyone know why non-stop services to Los Angeles were withdrawn by BOAC? (Also, am I right in assuming that they were not re-introduced until the DC10-30s were leased from Air New Zealand?)