region. The international airport is situated at the easternmost tip of the main island, and serves 185 cities in 58 countries. With the recent opening of the fourth terminal, Changi is now capable of handling more than 70 million passengers every year. Seletar Airport is Singapore's first civil aviation airport and is primarily used for private aviation. Heliports Aerial lift transport Cable car The Singapore Cable Car is a three-station gondola lift system that plies between Mount Faber on the main island of Singapore and the resort island of Sentosa via HarbourFront. Opened in 1974, it was the first aerial ropeway system in the world to span a harbour. The cable car system underwent a revamp that was completed in August 2010. In addition, a similar gondola lift system also operates within Sentosa as the Sentosa Line were opened in 2015. This line links Siloso Point to Imbiah. Maritime transport Ports and harbours The Port of Singapore, run by the port operators PSA International (formerly the Port of Singapore Authority) and Jurong Port, is the world's busiest in terms of shipping tonnage handled. 1.04 billion gross tons were handled in 2004, crossing the one billion mark for the first time in Singapore's maritime history. Singapore also emerged as the top port in terms of cargo tonnage handled with 393 million tonnes of cargo in the same year, beating the Port of Rotterdam for the first time in the process. In 2019, it handled a total of 626 million tonnes of cargo. In 2018, Singapore was ranked second globally in terms of containerised traffic, with 36.6 million Twenty-Foot Equivalent Units (TEUs) handled, and is also the world's busiest hub for transshipment traffic. Additionally, Singapore is the world's largest bunkering hub, with 49.8 million tonnes sold in 2018. In 2007, the Port of Singapore was ranked the world's busiest port, surpassing Hong Kong and Shanghai. The Port of Singapore is also ranked the Best Seaport in Asia. Passenger transport Water transport within the main island is limited to the River Taxi along the Singapore River. The service was introduced in January 2013, with low ridership. There are also daily scheduled ferry services from the Marina South Pier to the Southern Islands such as Kusu Island, Lazarus Island & Saint John's Island and Sisters' Islands. Changi Point Ferry Terminal in the east offers daily ferry services to Pulau Ubin and some destinations in