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From slop buckets to vacuum loos, we chart the history of in-flight relief – and explain the grim delights of blue ice

Unless you are extremely economical with your words, carrier pigeons aren't much good for sending post. And although letters had been sent by hot air balloon as early as 1785, you will, of course, find yourself at the mercy of the winds. It was only with the invention of the aeroplane that a viable way of sending airmail began to emerge. The United Provinces Industrial and Agricultural Exhibition, held in Allahabad, India, in 1911, provided just the opportunity to showcase the aeroplane's capabilities. The founder of the Royal Aero Club, Walter George Windham, sent to England for eight aircr...