'On Course' At School For Air Stewardesses -- Instructor J.S. Matthews demonstrating the correct way to set a tray aboard a model airliner at Heston. Watching him are - left to right - Mary Woodcock of Leeds; Lorna Farmer of Bournemouth; Terry Owen of Bristol and Monica Harper of London. With British Overseas Airways Corporation having decided to increase the number of air stewardesses on all routes, and particularly on the North American service, in readiness for the operation of new and bigger