El Tari Airport, formerly Penfui Airport, is an airport in Kupang on the island of Timor in the province of East Nusa Tenggara, Indonesia. The airport is named after El Tari (1926–1978), the governor of East Nusa Tenggara from 1966 to 1978. The airport's ICAO code was changed from WRKK to WATT in 2004. As of December 2018, there were at least 258 outbound flights per week from the airport.

Kupang, formerly known as Koepang or Coupang, is the capital of the Indonesian province of East Nusa Tenggara. At the 2020 Census, it had a population of 442,758; the official estimate as of mid-2023 was 466,632. It is the largest city and port on the island of Timor, and is a part of the Timor Leste–Indonesia–Australia Growth Triangle free trade zone. Geographically, Kupang is the southernmost city in Indonesia.