This episode's headline: Safeguarding Airports; Getting Ahead; Shields-Brooks; Conversation; Splendid Splinter. ANCHOR: JIM LEHRER; GUESTS: DAVID PLAVIN; ISAAC YEFFET; CORRESPONDENT: LEE HOCHBERG, FOCUS GETTING A HEAD START; MARK SHIELDS; DAVID BROOKS; STEVE BUCKLEY; CORRESPONDENTS: KWAME HOLMAN; RAY SUAREZ; SPENCER MICHELS; MARGARET WARNER; GWEN IFILL; TERENCE SMITH; KWAME HOLMAN