This episode's headline: Overcrowded Skies; Will We Learn? -- Dropping Out. The guests include In Washington: HENRY DUFFY, Airline Pilots Association; JOHN BAKER, Aircraft Owners and Pilots Association; In Seattle: JOHN NANCE, Author; In Wichita, Kansas: Rep. DAN GLICKMAN, Democrat, Kansas; REPORTS FROM NEWSHOUR CORRESPONDENTS: PETER GRAUMAN (KCET), in California; JOHN MERROW, in New York. Byline: In New York: ROBERT MacNEIL, Executive Editor; In Washington: JIM LEHRER, Associate Editor