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But there were no signs of security changes Monday at international airports in Syria and Lebanon, two of the countries on the U.S. list.

In South Korea, U.S.-bound passengers were required to go through additional security before boarding their flights and security officials were compiling lists of "suspicious" passengers to monitor based on their nationalities, travel patterns and ticket purchases.

In Australia, all passengers flying to the U.S. were being patted down and were having all their cabin luggage searched.

Baghdad's International Airport already has extremely tight security, with all luggage sniffed by dogs and passengers patted down before they can even enter the airport.

"Our security procedures at the airport are more intensified than that in any other airport in the world," said security official Umran Idris.

Maayan Malkin, spokeswoman for Israel Airports Authority, declined to discuss security arrangements. The Ben-Gurion International airport near Tel Aviv is considered one of the safest in the world.

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Associated Press writers Raphael G. Satter in London, Daniel Woolls in Madrid, Slobodan Lekic in Brussels, Zarar Khan in Islamabad, Ashraf Khan in Karachi, Rod McGuirk in Sydney, Teresa Cerojano in Manila, Denis Gray in Bangkok, Jae-soon Chang in Seoul, Bushra Juhi in Baghdad, Maamoun Youssef in Cairo, and Amy Teibel in Jerusalem contributed to this report.