MCLEAN, Va.—Hilton HHonors, the loyalty program for Hilton Worldwide’s 10 hotel brands, has partnered with the International Federation of Red Cross and Red Crescent Societies, the world’s largest humanitarian organization, to provide relief efforts for the victims of the March 11, 2011 earthquake and tsunami that devastated the eastern coastline of Japan. As part of a matching gift program, approximately 6,500 Hilton HHonors....