The effort does not involve changes to what travelers can take aboard flights. But passengers may see additional inspections of shoes and electronics, additional use of scanners designed to detect trace amounts of explosives, and another stage of screening at boarding gates, in some cases, the official said.
The measures do not involve U.S. domestic flights, and passengers could see changes as early as next week.
The changes came about based on new intelligence on terror groups trying to build new types of improvised explosives that are harder to detect, the official told CNN. There was no specific plot.