Saturday’ Sankei wrote that in response to the U.S. request to enhance aviation security to counter terrorism, major Japanese carriers will start stepping up security measures for U.S.-bound flights from July 18 by randomly checking passengers’ electronic devices for explosives before they board aircraft. The paper wrote that the new step may cause flight delays or other problems for passengers departing from Tokyo’s Haneda and Narita airports as well as five other major airports in Japan that operate direct flights to the U.S.