4. Hong Kong International Airport

                  Hong Kong International Airport is the main airport in Hong Kong. It is located on the island of Chek Lap Kok, which largely comprises land reclaimed for the construction of the airport itself. The airport is also colloquially known as Chek Lap Kok Airport, to distinguish it from its predecessor, the closed Kai Tak Airport.
                The airport has been commercially operational since 1998, replacing the former Kai Tak Airport, and is an important regional trans-shipment centre, passenger hub and gateway for destinations in Mainland China (with 45 destinations) and the rest of Asia.

                 Hong Kong International Airport is one of the busiest airports in Asia. Operated by the Airport Authority Hong Kong 24 hours a day, the airport is the primary hub for Cathay Pacific (the flag carrier of Hong Kong), Dragonair, Hong Kong Airlines, Hong Kong Express Airways and Air Hong Kong (cargo carrier). The airport is one of the hubs of Oneworld alliance, and it is also one of the Asian-Pacific cargo hubs for UPS Airlines.HKIA is an important contributor to Hong Kong's economy, with approximately 65,000 employees.
                 Hong Kong International Airport covers an area of 1,255 hectares (4.85 sq mi). The airport has a total of 66 boarding gates, with 66 jet bridge gates  and seven virtual gates. Cathay Pacific City, the head office of Cathay Pacific, is located on the airport property. Dragonair House, the head office of Dragonair, is also on the airport property. The head office of Air Hong Kong, as of 2004, is located on the fourth floor of the South Tower of Cathay Pacific City.

                                        

                 The airport has two parallel runways, both of which are 3,800 metres in length and 60 metres (200 ft) wide. The south runway has a Category II Precision Approach, while the north runway has the higher Category IIIA rating, which allows pilots to land in only 200-metre visibility. The two runways have an capacity of over 60 aircraft movements an hour. The Airport is upgrading ATC and runways so that they can handle 68 movements per hour. 

•  The airport is the world's busiest cargo gateway and one of the world's busiest passenger airports.
• The Hong Kong International Airport is also home to one of the world's largest passenger terminal buildings (the largest when opened in 1998).
• More than 100 airlines operate flights from the airport to over 180 cities across the globe.
•  In 2014, HKIA handled 63.3 million passengers, making it the 10th busiest airport worldwide by passenger traffic.
• It also surpassed Memphis International Airport to become the world's busiest airport by cargo traffic.