This episode's headline: Tower of Trouble; Fatal Flight; Feeding on Fear. The guests include SEN. HOWELL HEFLIN, [D] Alabama; SEN. NANCY KASSEBAUM, [R] Kansas; SEN. MALCOLM WALLOP, [R] Wyoming; SEN. CARL LEVIN, [D] Michigan; NORMAN ORNSTEIN, American Enterprise Institute; DAVID GERGEN, U.S. News & World Report; MARK SHIELDS, Washington Post; LAWRENCE NAGIN, United Airlines; BEVERLY NISBET, Passenger; ESSAYIST: ROGER ROSENBATT. Byline: In New York: ROBERT MacNeil; In Washington: JAMES LEHRER