Henri Coanda International Airport is Romania's busiest international airport, located 16.5 km (10.3 mi) northwest of the city of Bucharest. It is one of the two airports serving the Romanian capital city, along with Baneasa airport. The airport is located in Otopeni, north of Bucharest. It is named after Romanian flight pioneer Henri Coanda, the builder of Coanda-1910 aircraft and the discoverer of the Coanda effect of fluidics. Until May 2004, its official name was Bucharest Otopeni International Airport, and locally it is still quite frequently referred to by its former name.