Madrid's Adolfo Suárez Madrid-Barajas Airport is Europe's fourth largest. Terminal 4 (T-4) handles flights from 32 carriers, including American Airlines, British Airways, and Iberia. All other U.S. airlines use Terminal 1 (T-1).
Airport terminals are connected by bus service and also to Línea 8 of the metro, which takes you to the city center in 30 to 45 minutes for around €5 (€1.50–€2 plus a €3 airport supplement). For €5 there are also convenient buses (No. 203 and 203 Exprés) to the Atocha train station (with stops on O'Donnell and Cibeles) and to Avenida de América (note that bus drivers don't take bills greater than €20), where you can catch the metro or a taxi to your hotel. Taxis charge a flat fee of €30 from the airport to anywhere in the city center.