COVID-19 has brought an end to Atlanta's crown as the world's busiest airport in terms of passenger traffic. And it was not Chicago O'Hare or Dubai, its previous closest challengers, but Guangzhou Baiyun Airport that is now number one.The city of Guangzhou may be more familiar to you as Canton, the name long used by Westerners for the city that dominates the Peral River Delta in Southern China, about 85 miles north of Hong Kong. The Peral River Delta is now considered the world's most populous conurbation and the biggest manufacturing center in the world, following decades of outsourcing manufacturing...