This episode's headline: Westmoreland: On the Stand; A Street is Not a Home; Air Travel: Still Stacked Up. The guests include In Washington: LYLE DENNISTON, Baltimore Sun; HARVEY VIETH, Federal Task Force on the Homeless In Denver; FEDERICO PENA, Mayor of Denver, Colorado; In New York: ROBERT HAYES, Coalition for the Homeless; THOMAS MAIN, Former Managing Editor The Public Interest; Reports from NewsHour Correspondents: BRIAN STEWART (CBC), in Ethiopia; KWAME HOLMAN, in Denver. Byline: In New York: ROBERT MacNEIL, Executive Editor; In Washington: JIM LEHRER, Associate Editor; JUDY WOODRUFF, Correspondent