Major Japanese carriers will start randomly checking passengers' electronic devices for explosives before they board aircraft, responding to a U.S. request to enhance aviation security to counter terrorism, airport sources said Friday.The new measure will be taken from Tuesday, likely affecting Tokyo's Haneda airport and Narita airport near the capital as well as five other airports in the country that have direct flights to the United States. The implementation could cause flight delays as many passengers may be unaware of the new policy.The random screening will be conducted on electronic…READ FULL ARTICLE