later to return to Croydon to a jubilant welcome. The major aircraft used by Imperial Airways were the Handley Page HP42 and HP45 four-engined bi-planes Hannibal G-AAGX series and Heracles G-AAXC series. In 1938 the first four-engined monoplanes, Armstrong Whitworth Ensign series (G-ADSR) came into service. In November 1938 the Chamberlain