According to the 2019 study, the most active route at Adolfo Surez, MadridBarajas International Airport, (an airport that serves Madrid in Spain) is the Catalonia Barcelona which has three carriers serving in the location, while the least busy domestic route is AsturiasOviedo and has two carriers serving in the location.
Adolfo Suarez MadridBarajas Airport (Spanish: Aeropuerto Adolfo Suarez Madrid-Barajas [aeopweto aolfo swae mai aaxas) (IATA: MAD, ICAO: LEMD), commonly known as MadridBarajas Airport, is the main international airport serving Madrid in Spain. Busiest domestic routes at Adolfo Suarez, MadridBarajas International Airport (2019) Catalonia Barcelona Air Europa, Iberia, Vueling 1 10 Oviedo Air Europa, Iberia 2,573,822 Busiest European routes at MadridBarajas International Airport (2019) Lisbon, Portugal 1,557,731 548,114 Busiest intercontinental routes at MadridBarajas International Airport (2019) 1,030,397 1 
