This episode's headline: FAA: Slow on Safety?; Will We Learn? - A-B-C for Grownups; Iran: Confrontation in the Gulf; Boom to Bust. The guests include In Washington: DONALD ENGEN, Federal Aviation Administration; Dr. ADEED DAWISHA, George Mason University; In Philadelphia: ALVIN RUBINSTEIN, University of Pennsylvania; REPORTS FROM NEWSHOUR CORRESPONDENTS: JOHN MERROW; ELIZABETH BRACKETT, in Texas. Byline: In New York: ROBERT MacNEIL, Executive Editor; In Washington: JIM LEHRER, Associate Editor