The Spanish low cost carrier Vueling is the largest airline in the country, both when it comes to fleet size and number of destinations. The airline has its base in Barcelona, with two additional hubs in Paris and Rome. Vueling mostly offers European connections. Like most low cost operators Vueling isn’t a part of any major airline alliance, though they have codeshare agreements with several airlines.
An airline hub is an airport where the airline has a heavy presence and normally some kind of headquarters. On the other hand, a focus city is a destination where the airline operates limited point-to-point routes. In these cities, the airline doesn’t necessarily need to have an office (even though this sometimes is the case). Many low-cost airlines don't use the definition 'hub' but instead define their main airports of operations as an operating base.
IATA Code: VY
ICAO Code: VLG