@kvl nice idea. But a three-letter IATA code such as #yxu only has the ability to represent one of the 26*26*26 = 17576 possibilities, whereas there’re over 4 million cities and towns in the world. As such, a four-letter ICAO code, such as #cyxu, would be a better candidate. 26*26*26*26 = 456976 different locations could be shared globally. That said, either way would be better than #LdnOnt or #HamOnt, where I come from.