Paris’ main international airport lies northeast of the city centre. A free shuttle bus links its three terminals. RER Line B3 (Roissyrail) trains run from Terminal 2 to Gare du Nord and other central Paris RER stations, taking about 25 minutes. Roissybus shuttles link all three terminals with Place de l’Opéra. Buses depart every 15 minutes; journey time is about an hour. Air France shuttles stop at the Arc de Triomphe.