So......
The year was 1964, her daughter was 17, she's now a glamorous 70 ;-) , so that makes the year 1964. They took off from LGW, flew to Prestwick where they refuelled and took on more passengers. From there they flew nonstop over Iceland and Greenland until they landed in.....Montreal. Thence onto New York. From there an hour's flight in a jet that had tables with four facing seats in places and was so smooth in comparison with the rattling and loud prop liner. Suggestions as to the airlines and types please.