I only flew with Gus a very few times, but was struck by his quiet, practical professionalism and by his dry humour. For example, as a very senior captain, he would sometimes turn to a new F/O and inform him quite definitely and without a hint of a smile that it was now conclusively proven that the Earth was flat, and that the Moon landings were faked, and see what effect these revelations had on the new pilot who was then sometimes at a loss to know what to say! I recall, as others have mentioned, his TRI board brief demo which was a comic masterpiece, although at first we thought he was serious! Gus was a very decent, direct man who told it as it was (well, not the flat Earth etc!) with kindness, and (in the air at least) often instructed by example, simply doing something right rather than telling how it should be done. I send my condolences to his family for their loss.