Iberia is the largest airline in Spain. Based in Madrid, it operates an international network of services from its main bases of Adolfo Suárez Madrid-Barajas Airport and Barcelona El Prat Airport. Along with Air Nostrum and Iberia Express, it comprises Iberia Group, whose airlines fly to over 102 destinations in 39 countries, and 90 additional destinations through code-sharing agreements with other airlines. It has a customer service responsiveness rating of 3 out of 5.