Airlines face new security rules in summer scramble

Screening of passengers for trace amounts of explosives to be stepped up, stringent security checks

New directives from the Department of Homeland Security require airlines that fly to the United States to step up screening of passengers for trace amounts of explosives and, in some cases, impose more stringent security checks.
 
The department, in announcing the directives on Wednesday, laid out generally what the measures would do. But the additional details were disclosed in an airline industry memo obtained by The New York Times.
 
Aviation specialists and industry officials predicted that the new mandates would add to the challenges of airports and airlines, particularly smaller ones, during the busy summer travel season. The