user: You are a structured reasoning expert tasked with solving problems step by step. 
You first think about the reasoning process in the mind and then provide the answer. The reasoning process and answer should be enclosed within <think> </think> and <answer> </answer> tags, respectively, i.e., <think> reasoning process here </think> <answer> answer here </answer>. 
Given a question and the associated knowledge graph triplets (entity, relation, entity), you are asked to answer the question with these triplets and your own knowledge. 
You can break down the original question into several sub-questions and explore the given knowledge graph to solve them step-by-step. If there are multiple possible answers, choose one as the final answer. 
After thinking, when you finally reach a conclusion, clearly state the answer within <answer> </answer> tags, i.e., <answer> answer here </answer>. 
Question: which airport is closest to barcelona port? 
Knowledge Triplets: Barcelona, location.statistical_region.population, m.0k5301n
Catalonia, base.aareas.schema.administrative_area.capital, Barcelona
Besòs, location.location.containedby, Barcelona Metro
Montserrat, travel.tourist_attraction.near_travel_destination, Barcelona
m.051shf2, travel.transportation.transport_terminus, Muelle de Barcelona
Cerdanyola del Vallès, location.location.containedby, Province of Barcelona
Province of Barcelona, location.location.contains, El Papiol
Barcelona, film.film.edited_by, Christopher Tellefsen
Barcelona, common.topic.image, Barcelona intro
Barcelona, film.film.distributors, m.09hy063
Barcelona–El Prat Airport, aviation.airport.serves, Adventures by Disney - Italy: Tuscany
Barcelona, common.topic.webpage, m.0b6rvk0
Barcelona Metro, metropolitan_transit.transit_system.transit_lines, Barcelona Metro line 10
Barcelona, travel.travel_destination.climate, m.051szdj
Barcelona, travel.travel_destination.tour_operators, Adventures by Disney - Italy: Tuscany
Barcelona Metro, metropolitan_transit.transit_system.transit_lines, Barcelona Metro line 11
Province of Barcelona, location.location.contains, Manresa
FC Barcelona Bàsquet, common.topic.webpage, m.03ldyls
Barcelona, travel.travel_destination.climate, m.051szcp
Province of Barcelona, common.topic.image, Provmap-barcelona
Barcelona–El Prat Airport, aviation.airport.hub_for, Spanair
Cornellà de Llobregat, location.location.containedby, Province of Barcelona
Barcelona, travel.travel_destination.tourist_attractions, Tibidabo
Barcelona Metro, metropolitan_transit.transit_system.transit_lines, Barcelona Metro line 8
Barcelona, location.statistical_region.population, m.0k5303s
Barcelona, travel.travel_destination.tour_operators, Adventures by Disney - Barcelona Pre-Cruise Stay
Province of Barcelona, location.location.contains, Cornellà de Llobregat
Park Güell, travel.tourist_attraction.near_travel_destination, Barcelona
m.09w_8l3, common.webpage.topic, Barcelona
Adventures by Disney - Barcelona Pre-Cruise Stay, travel.tour_operator.travel_destinations, Barcelona
Barcelona Sants railway station, location.location.containedby, Spain
Barcelona, common.topic.webpage, m.09w_8l3
Barcelona, location.statistical_region.population, m.0k5304c
Plaça d'Espanya, Barcelona, location.location.geolocation, m.0wn0pnf
m.0648br5, location.mailing_address.citytown, Barcelona
Barcelona Metro, metropolitan_transit.transit_system.transit_lines, Barcelona Metro line 9
Province of Barcelona, location.location.contains, Gavà
Barcelona–El Prat Airport, aviation.airport.hub_for, Clickair
Poble Espanyol, location.location.containedby, Barcelona
m.05pwgj7, base.aubreymaturin.place_mention.place, Barcelona
m.09wy070, common.webpage.topic, Barcelona
Province of Barcelona, location.location.contains, El Prat de Llobregat
Barcelona Metro, metropolitan_transit.transit_system.transit_service_types, Rapid transit
Province of Barcelona, location.location.contains, Pallejà
Barcelona, common.topic.image, Barcelona
Barcelona, location.statistical_region.population, m.0k5303j
Barcelona–El Prat Airport, common.topic.image, Interior view of the airport
m.09x2d5n, common.webpage.topic, Barcelona
m.04hdfr3, location.mailing_address.citytown, Barcelona
Barcelona, travel.travel_destination.tourist_attractions, Magic Fountain of Montjuïc
La Rambla, Barcelona, common.topic.image, Busy-las-ramblas
Barcelona, film.film.starring, m.0jv0y5
Barcelona–El Prat Airport, travel.transport_terminus.travel_destinations_served, m.051r6vn
Barcelona, travel.travel_destination.tourist_attractions, Casa Vicens
m.051r6vn, travel.transportation.transport_terminus, Barcelona–El Prat Airport
Province of Barcelona, location.location.contains, Baix Llobregat
Barcelona, film.film.runtime, m.0jv0yr
Sagrada Família, location.location.containedby, Barcelona
Barcelona, travel.travel_destination.climate, m.051szd7
Province of Barcelona, location.location.contains, Berguedà
Barcelona Metro, common.topic.image, L2 9000
m.04ln55s, base.aubreymaturin.place_mention.place, Barcelona
Barcelona, location.statistical_region.population, m.0b7l52r
m.051szd7, travel.travel_destination_monthly_climate.travel_destination, Barcelona
Sant Andreu de Llavaneres, location.location.containedby, Province of Barcelona
Province of Barcelona, location.location.contains, Caldes d'Estrac
Barcelona, location.location.nearby_airports, Barcelona–El Prat Airport
Barcelona–El Prat Airport, aviation.airport.hub_for, Iberia
Gothic Quarter, Barcelona, travel.travel_destination.tour_operators, Adventures by Disney - Barcelona Pre-Cruise Stay
Barcelona, location.statistical_region.population, m.0k53024
Province of Barcelona, location.location.geolocation, m.02_h1z6
Province of Barcelona, location.location.contains, Canyelles
Barcelona, location.location.time_zones, Central European Time Zone
Barcelona, base.aubreymaturin.place.mentions, m.04ln55s
Barcelona, common.topic.article, m.030bg9
Barcelona, travel.travel_destination.climate, m.051szfn
Barcelona, travel.travel_destination.tourist_attractions, Museu Nacional d'Art de Catalunya
Province of Barcelona, location.location.contains, Osona
Province of Barcelona, location.es_province.capital, Barcelona
Barcelona Metro, metropolitan_transit.transit_system.transit_lines, Barcelona Metro line 3
Barcelona, travel.travel_destination.tourist_attractions, Park Güell
Province of Barcelona, location.location.contains, Sant Sadurní d'Anoia
Barcelona, location.location.geolocation, m.02nnkjz
Camp Nou, travel.tourist_attraction.near_travel_destination, Barcelona
Province of Barcelona, location.location.contains, Sant Vicenç dels Horts
Barcelona Metro, location.location.contains, Besòs
Tibidabo, location.location.containedby, Barcelona
m.051r6wb, travel.transportation.transport_terminus, Barcelona Sants railway station
Calaf, location.location.containedby, Province of Barcelona
Plaça d'Espanya, Barcelona, location.location.containedby, Barcelona
PortAventura, travel.tourist_attraction.near_travel_destination, Catalonia
Barcelona Metro, metropolitan_transit.transit_system.transit_lines, Barcelona Metro line 4
m.04hv8dm, film.performance.film, Barcelona
Sant Esteve Sesrovires, location.location.containedby, Province of Barcelona
Olesa de Montserrat, location.location.containedby, Province of Barcelona
Mataró, location.location.containedby, Province of Barcelona
Barcelona, film.film.runtime, m.0cw0b2f
Barcelona Nord, travel.transport_operator.travel_destinations_served, m.051r6vy
Museu Nacional d'Art de Catalunya, travel.tourist_attraction.near_travel_destination, Barcelona
Barcelona, location.statistical_region.population, m.0k5302h
Barcelona Nord, location.location.containedby, Spain
Barcelona Sants railway station, travel.transport_terminus.travel_destinations_served, m.051r6wb
Barcelona, travel.travel_destination.climate, m.051szg6
Plaça d'Espanya, Barcelona, common.topic.article, m.02rm8r3
Barcelona, location.statistical_region.population, m.0k5302r
Province of Barcelona, location.location.contains, L'Hospitalet de Llobregat
Barcelona, travel.travel_destination.how_to_get_here, m.051r6vy
Province of Barcelona, common.topic.article, m.012406
m.051szf2, travel.travel_destination_monthly_climate.travel_destination, Barcelona
Province of Barcelona, location.location.contains, Sant Andreu de Llavaneres
Barcelona, film.film_location.featured_in_films, The Passenger
Barcelona, common.topic.webpage, m.09yk8mv
Museu Nacional d'Art de Catalunya, location.location.containedby, Barcelona
Barcelona, travel.travel_destination.tourist_attractions, Sagrada Família
BCN01 edit1, common.image.appears_in_topic_gallery, Barcelona
Worldreader, organization.organization.geographic_scope, Barcelona
m.04yv988, common.webpage.topic, Barcelona–El Prat Airport
Plaça d'Espanya, Barcelona, common.topic.notable_for, g.1259rjx2n
Arc de Triomf, travel.tourist_attraction.near_travel_destination, Barcelona
Barcelona, travel.travel_destination.tour_operators, Adventures by Disney - 7-Night Mediterranean Magic Cruise
m.09x0hct, common.webpage.topic, Barcelona
m.0btjp73, award.ranking.item, Barcelona
The Passenger, common.topic.image, Roof of Casa Mila, Barcelona
m.051szcp, travel.travel_destination_monthly_climate.travel_destination, Barcelona
m.0fpsg28, common.webpage.topic, FC Barcelona Bàsquet
Barcelona Metro, common.topic.image, Catalunya metro station
Barcelona, location.statistical_region.population, m.0k52__s
La Rambla, Barcelona, transportation.road.major_cities, Barcelona
m.051szjw, common.webpage.topic, Barcelona
Barcelona Metro, common.topic.notable_for, g.125b9r4dz
Barcelona, film.film.featured_film_locations, Catalonia
m.0b489y_, common.webpage.topic, Barcelona
Province of Barcelona, location.location.contains, Vilanova de Sau
Province of Barcelona, location.location.contains, Sant Cugat del Vallès
Sushifresh, organization.organization.geographic_scope, Barcelona
Province of Barcelona, location.location.contains, Sant Andreu de la Barca
PortAventura, location.location.containedby, Catalonia
m.051szgh, travel.travel_destination_monthly_climate.travel_destination, Barcelona
Barcelona, travel.travel_destination.climate, m.051szfy
m.0cw0b2f, film.film_cut.film, Barcelona
La Rambla, Barcelona, location.location.containedby, Barcelona
El Prat de Llobregat, location.location.nearby_airports, Barcelona–El Prat Airport
Barcelona, location.capital_of_administrative_division.capital_of, m.0jvvksh
Province of Barcelona, location.location.contains, Barcelona
Barcelona, common.topic.image, BCN01 edit1
FC Barcelona Bàsquet, common.topic.notable_for, g.1259ftgc4
Barcelonès, location.es_comarca.capital, Barcelona
Barcelona, location.statistical_region.population, m.0b7l52j
Barcelona, base.biblioness.bibs_location.country, Spain
Sant Andreu de la Barca, location.location.containedby, Province of Barcelona
Barcelona, common.topic.webpage, m.09wy070
m.09scp83, common.webpage.topic, FC Barcelona Bàsquet
FC Barcelona, freebase.valuenotation.is_reviewed, Official website
Camp Nou, location.location.containedby, Barcelona
m.051r6vn, travel.transportation.travel_destination, Barcelona
Province of Barcelona, location.location.contains, Sant Feliu de Llobregat
Besòs, location.location.containedby, Barcelona
m.0jv0yr, film.film_cut.film, Barcelona
Barcelona, travel.travel_destination.climate, m.051szgh
m.051r6wb, travel.transportation.travel_destination, Barcelona
m.051szcd, travel.travel_destination_monthly_climate.travel_destination, Barcelona
Barcelona, travel.travel_destination.how_to_get_here, m.051r6wb
La Rambla, Barcelona, common.topic.notable_for, g.125dm_y55
Design Museum of Barcelona, travel.tourist_attraction.near_travel_destination, Barcelona
Barcelona Metro, metropolitan_transit.transit_system.transit_lines, Barcelona Metro line 7
Barcelona, travel.travel_destination.tourist_attractions, Camp Nou
Barcelona, film.film.featured_film_locations, Barcelona
m.03js4np, film.performance.film, Barcelona
Barcelona–El Prat Airport, aviation.airport.operator, ENAIRE
Casa Milà, travel.tourist_attraction.near_travel_destination, Barcelona
Magic Fountain of Montjuïc, travel.tourist_attraction.near_travel_destination, Barcelona
Parc del Laberint d'Horta, travel.tourist_attraction.near_travel_destination, Barcelona
Sant Sadurní d'Anoia, location.location.containedby, Province of Barcelona
Gothic Quarter, Barcelona, location.location.geolocation, m.0wmcf3s
Barcelona, film.film.starring, m.0gcpm46
Province of Barcelona, location.location.contains, Vilassar de Mar
Province of Barcelona, location.location.contains, Olesa de Montserrat
m.051r6wb, travel.transportation.transport_terminus, Barcelona França railway station
Province of Barcelona, base.biblioness.bibs_location.city, Catalonia
Barcelona, location.statistical_region.population, g.11bcdlfm6b
m.02h7hws, aviation.airline_airport_presence.airport, Barcelona–El Prat Airport
Barcelona–El Prat Airport, common.topic.webpage, m.04yv988
m.04z5fp9, location.mailing_address.citytown, Barcelona
Barcelona, travel.travel_destination.tourist_attractions, Museu Picasso
Province of Barcelona, location.location.contains, Berga
Barcelona, travel.travel_destination.tourist_attractions, Cursa de Bombers
Barcelona Metro, metropolitan_transit.transit_system.transit_lines, Barcelona Metro line 1
Barcelona, travel.travel_destination.tour_operators,   Adventures by Disney - 5-Night Mediterranean Magic Cruise
Barcelona Museum of Contemporary Art, travel.tourist_attraction.near_travel_destination, Barcelona
m.051szdj, travel.travel_destination_monthly_climate.travel_destination, Barcelona
Barcelona–El Prat Airport, common.topic.image, Nueva T1 de Barcelona
Province of Barcelona, location.location.contains, Cervelló
m.051szcz, travel.travel_destination_monthly_climate.travel_destination, Barcelona
Montjuïc Cemetery, travel.tourist_attraction.near_travel_destination, Barcelona
Palau Sant Jordi, location.location.containedby, Barcelona
m.06wgpv0, common.webpage.topic, Barcelona
Barcelona, symbols.namesake.named_after, Hamilcar Barca
Tibidabo, travel.tourist_attraction.near_travel_destination, Barcelona
Barcelona–El Prat Airport, aviation.airport.hub_for, Let's Fly
Barcelona França railway station, travel.transport_terminus.travel_destinations_served, m.051r6wb
Province of Barcelona, location.location.contains, Sant Esteve Sesrovires
Barcelona, travel.travel_destination.tourist_attractions, Parc del Laberint d'Horta
m.0gcpm46, film.performance.film, Barcelona
Montjuïc, travel.tourist_attraction.near_travel_destination, Barcelona
Barcelona Metro, metropolitan_transit.transit_system.area_served, Barcelona
m.093_qk1, common.webpage.topic, Barcelona
Barcelona–El Prat Airport, common.topic.notable_for, g.1255mq12p
m.0jvvl5d, location.administrative_division_capital_relationship.capital, Barcelona
Province of Barcelona, location.location.contains, Alt Penedès
Barcelona França railway station, location.location.containedby, Spain
Gothic Quarter, Barcelona, travel.tourist_attraction.near_travel_destination, Barcelona
Province of Barcelona, location.location.contains, Collbató
Barcelona, travel.travel_destination.tourist_attractions, Casa Milà
Plaça d'Espanya, Barcelona, common.topic.image, De venetianske tårna ved Plaça d'Espanya.
Barcelona, common.topic.notable_for, g.125dj14w3
Palau de la Música Catalana, location.location.containedby, Barcelona
Barcelona, location.citytown.postal_codes, 08021
Plaça d'Espanya, Barcelona, common.topic.notable_types, Tourist attraction
Muelle de Barcelona, travel.transport_terminus.travel_destinations_served, m.051shf2
Sant Vicenç dels Horts, location.location.containedby, Province of Barcelona
Barcelona–El Prat Airport, aviation.airport.focus_city_for, Iberia
Casa Vicens, travel.tourist_attraction.near_travel_destination, Barcelona
Casa Milà, location.location.containedby, Barcelona
Park Güell, location.location.containedby, Barcelona
Museu Picasso, travel.tourist_attraction.near_travel_destination, Barcelona
Barcelona, location.citytown.postal_codes, 08005
Tibidabo, common.topic.image, Barcelona
Barcelona, common.topic.webpage, m.09y0979
m.0117878d, location.mailing_address.citytown, Barcelona
m.0n7wv4r, award.award_honor.honored_for, Barcelona
Barcelona, travel.travel_destination.tourist_attractions, Gothic Quarter, Barcelona
Barcelona, travel.travel_destination.climate, m.051szcz
Adventures by Disney, travel.tour_operator.travel_destinations, Barcelona
m.094m4d6, common.webpage.topic, Barcelona
25 Carat, film.film.featured_film_locations, Barcelona
Besòs, metropolitan_transit.transit_stop.transit_lines, Barcelona Metro line 4
Province of Barcelona, location.location.contains, Molins de Rei
Barcelona, travel.travel_destination.tourist_attractions, Montjuïc Cemetery
Montjuïc, location.location.containedby, Barcelona
Barcelona, business.business_location.parent_company, Redcorus
El Prat de Llobregat, location.location.containedby, Province of Barcelona
m.051r6vy, travel.transportation.travel_destination, Barcelona
Province of Barcelona, location.location.contains, Cardona, Spain
Barcelona Metro, metropolitan_transit.transit_system.transit_lines, Barcelona Metro line 13
Barcelona, freebase.valuenotation.is_reviewed, Official website
m.051szfn, travel.travel_destination_monthly_climate.travel_destination, Barcelona
Barcelona Metro, common.topic.article, m.02m527
Province of Barcelona, location.location.contains, Eurostars Grand Marina Hotel
Montcada i Reixac, location.location.containedby, Province of Barcelona
Cursa de Bombers, travel.tourist_attraction.near_travel_destination, Barcelona
Barcelona, travel.travel_destination.local_transportation, Barcelona Metro
Barcelona, location.capital_of_administrative_division.capital_of, m.0jvvkt4
Cabrera de Mar, location.location.containedby, Province of Barcelona
Barcelona, travel.travel_destination.climate, m.051szfc
Province of Barcelona, location.location.contains, Vic
Barcelona–El Prat Airport, aviation.airport.hub_for, Air Nostrum
m.051szg6, travel.travel_destination_monthly_climate.travel_destination, Barcelona
Province of Barcelona, location.location.contains, Espacio Movistar
m.04hcqqb, location.mailing_address.citytown, Barcelona
m.02_7m73, location.mailing_address.citytown, Barcelona
Casa Vicens, location.location.containedby, Barcelona
Plaça d'Espanya, Barcelona, common.topic.image, Montjuic Placa Espanya Barcelona
m.0cj67m2, common.webpage.topic, Barcelona
m.094h6_b, common.webpage.topic, Barcelona
Barcelona, common.topic.article, m.01f6d
Barcelona, location.statistical_region.population, m.0k5304m
Province of Barcelona, location.location.contains, Cabrera de Mar
Barcelona Metro, metropolitan_transit.transit_system.transit_lines, Barcelona Metro line 2
Barcelona, location.statistical_region.population, m.0k5301b
m.0j9vdn6, common.webpage.topic, Design Museum of Barcelona
Province of Barcelona, location.location.contains, Vilassar de Dalt
Qué!, book.newspaper.circulation_areas, Barcelona
Barcelona, location.statistical_region.population, m.0b7l51q
Barcelona, common.topic.webpage, m.09x0hct
Barcelona, location.location.nearby_airports, Barcelona–El Prat Airport
m.0j2f54z, common.webpage.topic, Barcelona–El Prat Airport
Province of Barcelona, location.location.containedby, Spain
m.011tybrs, location.mailing_address.state_province_region, Province of Barcelona
Arc de Triomf, location.location.containedby, Barcelona
Barcelona, common.topic.webpage, m.0b489y_
m.012dtbjz, location.mailing_address.state_province_region, Province of Barcelona
Barcelona Metro, metropolitan_transit.transit_system.transit_lines, Barcelona Metro line 5
Barcelona, common.topic.webpage, m.06wgpv0
Caldes d'Estrac, location.location.containedby, Province of Barcelona
Province of Barcelona, location.location.contains, Barberà del Vallès
m.0117878d, location.mailing_address.state_province_region, Province of Barcelona
Conservatori Superior de Música del Liceu, location.location.containedby, Barcelona
FC Barcelona, common.topic.subjects, Barcelona Exclusive Private Tours
Barcelona–El Prat Airport, common.topic.article, m.013q80
Province of Barcelona, location.location.contains, Ripollet
Barcelona, travel.travel_destination.how_to_get_here, m.051shf2
Barcelona, film.film.music, Mark Suozzo
Barcelona, common.topic.webpage, m.09x2d5n
Design Museum of Barcelona, location.location.geolocation, m.011dyf9z
FC Barcelona Bàsquet, common.topic.webpage, m.09scp83
Barcelona, location.statistical_region.population, m.0b7l52z
Barcelona, travel.travel_destination.tourist_attractions, Palau de la Música Catalana
m.0652g2z, base.popstra.vacation_choice.location, Province of Barcelona
Barcelona, common.topic.notable_for, g.12564bp7r
Barcelona, location.statistical_region.population, m.0k5300c
m.051r6vy, travel.transportation.transport_operator, Barcelona Nord
La Rambla, Barcelona, common.topic.article, m.03q84v
Barcelona–El Prat Airport, aviation.airport.focus_city_for, Jet4you
Barcelona Metro, location.location.geolocation, m.0ztn37c
Barcelona–El Prat Airport, aviation.airport.hub_for, g.1ywpnwk60
Barcelona, common.topic.webpage, m.094h6_b
Province of Barcelona, location.location.contains, Corbera de Llobregat
Barcelonès, base.aareas.schema.administrative_area.capital, Barcelona
L'Hospitalet de Llobregat, location.location.containedby, Province of Barcelona
Barcelona en Comú, organization.organization.geographic_scope, Spain
Barcelona, location.administrative_division.country, Spain
Barcelona, location.location.containedby, Spain
Barcelona–El Prat Airport, common.topic.image, Aeroport de Barcelona 1
Province of Barcelona, base.biblioness.bibs_location.country, Spain
Barcelona, base.aubreymaturin.place.mentions, m.05pwgj7
Barcelona, film.film.starring, m.0cg0jg2
Barcelona, location.statistical_region.population, m.0k52_z5
Barcelona–El Prat Airport, aviation.airport.focus_city_for, Air Europa
Avui, book.newspaper.circulation_areas, Barcelona
Province of Barcelona, location.location.contains, Vallès Oriental
Barcelona, location.statistical_region.population, m.0k53038
m.051szdt, travel.travel_destination_monthly_climate.travel_destination, Barcelona
Buried, film.film.featured_film_locations, Barcelona
Barcelona, film.film.starring, m.04hv8dm
Province of Barcelona, location.location.contains, Mataró
m.011tyc24, common.phone_number.service_location, Barcelona
Sagrada Família, travel.tourist_attraction.near_travel_destination, Barcelona
FC Barcelona Bàsquet, common.topic.article, m.0953q9
Barcelona–El Prat Airport, common.topic.webpage, m.0gz37yx
Barcelona–El Prat Airport, aviation.airport.hub_for, Girjet
Barcelona, location.location.containedby, Province of Barcelona
Barcelona, common.topic.webpage, m.093_qk1
Province of Barcelona, location.location.contains, Martorell
Barcelona, travel.travel_destination.tour_operators, Adventures by Disney
Barcelona, travel.travel_destination.tourist_attractions, Arc de Triomf
Plaça d'Espanya, Barcelona, common.topic.image, PlacadEspayaBarcelona
Barcelona, location.statistical_region.population, g.1245_5wvw
Province of Barcelona, location.location.contains, Abrera
m.02nxn53, location.mailing_address.citytown, Barcelona
Barcelona intro, common.image.appears_in_topic_gallery, Barcelona
Barcelona, location.statistical_region.population, m.0k5301x
Barcelona, travel.travel_destination.climate, m.051szdt
Sant Feliu de Llobregat, location.location.containedby, Province of Barcelona
Barcelona, location.statistical_region.population, m.0b7l51y
Province of Barcelona, location.location.contains, Santa Coloma de Gramenet
m.011tybrs, location.mailing_address.citytown, Barcelona
Barcelona, travel.travel_destination.tourist_attractions, Plaça d'Espanya, Barcelona
Barcelona, location.location.containedby, Catalonia
Muelle de Barcelona, location.location.containedby, Spain
La Rambla, Barcelona, common.topic.notable_types, Tourist attraction
m.09y0979, common.webpage.topic, Barcelona
Barcelona, film.film.country, United States of America
Barcelona intro, common.image.size, m.063cyqs
m.03ldyls, common.webpage.topic, FC Barcelona Bàsquet
Corbera de Llobregat, location.location.containedby, Province of Barcelona
Province of Barcelona, location.location.contains, Sabadell
Barcelona–El Prat Airport, aviation.airport.hub_for, Vueling
Barcelona, location.capital_of_administrative_division.capital_of, m.0jvvl5d
Barcelona–El Prat Airport, common.topic.notable_types, Airport
Barcelona, common.topic.subject_of, Hotel in Barcelona
Barcelona, travel.travel_destination.tourist_attractions, La Rambla, Barcelona
Barcelona, location.statistical_region.population, g.11bc860_dg
Barcelona, travel.travel_destination.climate, m.051szcd
Barcelona, common.image.appears_in_topic_gallery, Barcelona
La Rambla, Barcelona, travel.tourist_attraction.near_travel_destination, Barcelona
Redcorus, organization.organization.locations, Barcelona
Barcelona, location.statistical_region.population, g.11bcdlbdfj
Province of Barcelona, location.location.contains, Mollet del Vallès
Barcelona en Comú, organization.organization.geographic_scope, Catalonia
Adventures by Disney - Italy: Tuscany, location.location.nearby_airports, Barcelona–El Prat Airport
Majorca, travel.travel_destination.tour_operators, Adventures by Disney - Barcelona Pre-Cruise Stay
Esplugues de Llobregat, location.location.containedby, Barcelona
Barcelona, travel.travel_destination.tourist_attractions, Montserrat
m.09yk8mv, common.webpage.topic, Barcelona
Barcelona, base.ontologies.ontology_instance.equivalent_instances, m.09bxkp4
La Rambla, Barcelona, location.location.containedby, Spain
Barcelona, location.statistical_region.population, g.1245_w4r_
Palau Blaugrana, location.location.containedby, Barcelona
Barcelona, common.topic.webpage, m.094m4d6
Barcelona, common.topic.webpage, m.051szjw
Barcelona Metro, common.topic.notable_types, Mass Transportation System
Barcelona–El Prat Airport, aviation.airport.serves, Barcelona
Barcelona, travel.travel_destination.tourist_attractions, Montjuïc
Spain, travel.travel_destination.tour_operators, Adventures by Disney - Barcelona Pre-Cruise Stay
m.051shf2, travel.transportation.travel_destination, Barcelona
The Passenger, film.film.featured_film_locations, Barcelona
Barcelona–El Prat Airport, location.location.containedby, Spain
Barcelona, common.topic.webpage, m.0cj67m2
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La Rambla, Barcelona, location.location.geolocation, m.02_v_4k
Barcelona–El Prat Airport, location.location.geolocation, m.02_h61n
m.04hd7fm, location.mailing_address.citytown, Barcelona
Ryanair, aviation.airline.hubs, Barcelona–El Prat Airport
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Province of Barcelona, location.location.containedby, Catalonia
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Barcelona–El Prat Airport, aviation.airport.serves, El Prat de Llobregat
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Barcelona, location.statistical_region.population, m.0k53030
Province of Barcelona, location.location.contains, Calaf
El Papiol, location.location.containedby, Province of Barcelona
Santa Coloma de Gramenet, location.location.containedby, Province of Barcelona
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Barcelona–El Prat Airport, aviation.airport.airlines, m.02h7hws

Answer: Barcelona–El Prat Airport