In the 60s BOAC had a terrible accident rate
I can only find two 'hull loss' accidents in the 60's;
March 1966 Boeing 707 G-APFE broke up in CAT over Mt Fuji.
April 1968 G-ARWE Boeing 707 uncontained engine fire on take-off at LHR.
Hardly a 'terrible' accident rate unless you know otherwise.