IT MAY BE a painful fact to contemplate during these locked-down days, but last year the world was more mobile than ever, with people taking 4.6bn flights. In April this year, though, planes carried just 47m passengers; that level of mobility, annual-ised, would set the clocks back to 1978. The virtual halt to travel has exacerbated the global economy's woes, complicating trade ties, upending business and devastating the tourism industry. Little wonder that governments want to restore links. An idea gaining favour is the creation of travel "bubbles", binding together countries that have fared well against the coronavirus.
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