This was a program started by British Airways’ predecessor, BOAC (British Overseas Airways Corporation), on 26 March 1957 and was continued, when BOAC and BEA (British European Airways) merged in 1974 to form British Airways . Membership was free and you received a hard cover little notebook to log your flights in. You would give the book to the flight attendant and s/he would take it to the cockpit to be filled out.When you reached 25,000 miles, you could return it to British Airways and get a special mileage certificate as they say in the back of this book. BA discontinued the JJC program in 1984.