Progress, in aviation, means quite a lot. When one considers how the last thirty years have seen telescoped into their span as much progress in air transport as three thousand achieved in transport by land or sea, one realises that every year that passes makes the achievement of the last seem out-of-date and stale. There is every reason, therefore, for the layman who wants to be intelligently air-minded to be periodically informed by an expert of the most recent advances that have been made. Tonight Sir Sefton Brancker, who has been Director of Civil Aviation to the Air Ministry since 1922, will give such a survey, the occasion being particularly appropriate, since the Royal Air Force Display took place last Saturday, and the Aeronautical Exhibition at Olympia opens tomorrow.