The chief of the UN nuclear agency Yukiya Amano

Director General of the International Atomic Energy Agency, IAEA, Yukiya Amano from Japan and Herman Nackaerts, from left, of the IAEA the chief agency official in charge of the Iran file speak to the media before his flight to Iran at the Vienna International Airport near Schwechat, Austria, on Sunday, May 20, 2012. (AP Photo/Ronald Zak)

Amano leaves Tehran hopefully