El Tari International Airport (Indonesian: Bandar Udara Internasional El Tari) (IATA: KOE, ICAO: WATT) is an airport in Kupang, East Nusa Tenggara, Indonesia. The airport is named after El Tari, the governor of East Nusa Tenggara from 1966 to 1978. The airport's ICAO code was changed from WRKK to WATT in 2004. The airport used to serve international routes to Dili and Darwin. This was closed in the 1990s, due to the violation of human rights by the Indonesian Armed Forces in East Timor. The Kupang-Dili route is well be resumed on 15 December 2017, operated by Air Timor.
On 10 June 2013, Merpati Nusantara Airlines Flight 6517, a Xian MA60 operated by Merpati Nusantara Airlines suffered a structural failure and crashed on the runway after a hard landing. No one was killed in the crash, but 25 people were injured. 5, including the Captain, was seriously injured. An investigation by the NTSC found that the pilot moved the throttle to the way back, causing the aircraft to lose lift. The crash was the second hull loss of a Xi'an MA60 operated by Merpati.