U.S. Secretary of State John Kerry (2nd R) walks across the tarmac of Baghdad International Airport as he prepares to board an aircraft out of the Iraqi capital March 24, 2013. Kerry made an unannounced visit to Iraq on Sunday and said he told Prime Minister Nuri al-Maliki of his concern about Iranian flights over Iraq carrying arms to Syria. REUTERS/Jason Reed (IRAQ – Tags: POLITICS) – RTXXVZZ