DXB: Dubai International Airport is the world's busiest airport by international passenger traffic. DXB, which returned to 100% operational capacity in mid-December, retained its status as the world’s busiest international airport in December 2021 with 3.542 million seats, according to UK’s global travel data provider OAG. During the first 11 months of 2021, DXB received over 24 million passengers. With high vaccination rates and strict precautionary measures, Dubai is also Tripadvisor’s most popular destination for 2022 — followed by London (UK), Cancun (Mexico), Bali (Indonesia) and Crete (Greece).