Sultan Aji Muhammad Sulaiman Sepinggan Airport  Sultan Aji Muhammad Sulaiman Sepinggan International Airport () (IATA: BPN, ICAO: WALL), also known as Sepinggan Airport, is an international airport serving the city of Balikpapan and adjacent areas of East Kalimantan, located in Kalimantan, Indonesia. The airport began its new operational phase on August 6, 1997, with new building and runway structure, replacing old structure on the same site. The airport is operated by PT. Angkasa Pura I, which has an area of 300 hectares. The Airport is the 6th busiest airport in Indonesia and the busiest airport in Kalimantan and second in Borneo after Kota Kinabalu International Airport. Sepinggan airport was named the second best in service in the world for airports with annual handling capacity of 5 million to 15 million passengers in 2018 awarded by Airports Council International. The construction of Sultan Aji Muhammad Sulaiman Sepinggan International Airport started in the Dutch colonial era before Indonesian independence. It was used mainly for the Dutch Oil Company's activities in the Balikpapan area. The airport soon became public and commercial after its management was handed over to Direktorat Jenderal Perhubungan Udara of Republic Indonesia in 1960. Sultan Aji Muhammad Sulaiman Sepinggan International Airport was finally managed by Perum Angkasa Pura I (PT Angkasa Pura I on present day) due to Government Regulation (PP) No.1 on 9 January 1987. With numerous buildings located around the airport and its only runway jutting out into the settlement, landings at the airport were dramatic to experience and technically demanding for pilots. Sultan Aji Muhammad Sulaiman Sepinggan International Airport had been renovated twice from 1991 to 1997. The first phase was started in 1991 and ended in 1994, to renovate the taxiway, passenger and cargo terminals and lengthen the runway. In 1995, the Indonesian government announced Sultan Aji Muhammad Sulaiman Airport as the fifth Indonesian hajj embarkation airport for Kalimantan region which also consists West Kalimantan, Central Kalimantan and South Kalimantan province. The second phase renovation took place in 1996 to renovate the hangars, fuel depots and the administration buildings. The second phase was finished and the airport started its new operational era with the new buildings and facilities in 1997. The important timeline of the airport:   The new terminal was tested on 22 March 2014 with capacity 10 million passengers per year in 110,000-meter square area with Rp2 trillion ($178 million) investment as the biggest airport in East Indonesia which overcame the overcapacity of 7.1 million passengers last year in only 1.7 million capacity of old terminal.