That's the perhaps surprising message from Paul Griffiths, chief executive of the world's leading international airport: Dubai, whose code is DXB. Paul also tells me about Dubai's remarkable growth trajectory – and how close DXB will come to the magic figure of 100 million passengers this year.

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What makes a great city? The man who knows is top geographer David Gilbert, Professor of Urban and Historical Geography at The Royal Holloway Centre for the GeoHumanities. He tells me the key virtues of cities, and kindly takes part in a quickfire round in which he has less than a second to decide whether a city is great or not. You may be surprised by some of his answers ...

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Captain David Sanders, who has a long and distinguished career in aviation, tells me how passengers could help themselves by turning up on time and not drinking to excess; the joys of flying; and the most beautiful flightpaths.

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It's Travel Desk Tuesday, and cruise writer Marc Shoffman is bringing me up to speed on the joys of river cruising – in Europe and beyond.

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Sharon Cleator has been travelling to the lovely south coast of Portugal for 40 years. She knows the Algarve like the back of her hand, and now offers a travel concierge service that you can track down online at Sharon’s Solutions

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The Trevi fountain in the Italian capital has been overrun by tourists for many years, and now the Roman authorities are seeking to impose some order. But top Rome cultural guide James Hill is unimpressed.

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In the second part of my conversation with Buenos Aires local Stephen Melton, we discuss the highlights of Argentina beyond the capital.

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In the beautiful wrought-iron market of San Telmo in Buenos Aires, British teacher and all-round Latin legend Stephen Melton has been telling me about the Argentinian capital – what to see, and what to watch out for.

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