The US city comes top ahead of London, which last held the top spot in 2014, and Paris completing the top three. Paris has solidified its status as a European business hub, with air travel to the French capital increasing by more than 20% from January to December.

Overall, Asia dominates the rankings with four cities in the top 10 this year, and seven within the top 20, including the re-emergence of South Korean capital Seoul, which had fallen out of the rankings last year.