Whilst the above an ironic quote from the late great Sir George Edwards, my personal favourite of his (at the risk of going slightly off-topic), was on the first commercial flight of Concorde. A VIP sitting next to Sir George commented that, flying at twice the speed of sound in Concorde seemed absolutely no different, as to flying in a conventional subsonic jetliner. Sir George laconically replied 'yes, that was the difficult bit...'