If you travel around the Barcelona metropolitan area often, you've probably ridden on one of its buses. Monbus is the company that operates services such as Aerobús, which connects Barcelona with El Prat airport; lines that connect the Catalan capital with Vilafranca, Manresa, Igualada, Valls or Reus; and urban buses in smaller municipalities, such as Esparreguera and Abrera, in Baix Llobregat Nord.