Sorry to be tedious here, but here's an Air France timetable from 1958, just 4 years before the clip, London to La Baule (in the bottom left hand corner), and the airport there is shown in small type as St Nazaire-Montoire as well.
http://www.timetableimages.com/ttima...58/af58-22.jpg
In 1958 that was in a DC3, which could probably have got into the other La Baule if they had wanted.