The regulator is expanding a program that has let smaller companies and technology start-ups keep some information secret early in the I.P.O. process. br br Passengers at Heathrow Airport near London. New rules require 280 airports that are the last point of departure for flights to the United States to have explosive-detection technology installed within weeks. br Airlines Face New Security Rules in Summer Scramble br By MICAH MAIDENBERG br Airlines are rushing to work with airports to comply with Department of Homeland Security directives on screening passengers on flights to the U.S. br br br Fear of an End to Easy Money Prompts Sell-Off br By LANDON THOMAS Jr. br A cautionary speech by Mario Draghi, the president of the European Central Bank spooked the European bond market, then selling spread to global stocks.