CREATE TABLE table_72843 ("Poll Year" TEXT, "Winner" TEXT, "Second" TEXT, "Third" TEXT, "Fourth" TEXT, "Fifth" TEXT, "Sixth" TEXT, "Seventh" TEXT, "Eighth" TEXT, "Ninth" TEXT, "Tenth" TEXT)

Who was in 4th when in 6th is Air Traffic?
SELECT "Fourth" FROM table_72843 WHERE "Sixth" = 'Air Traffic'
SELECT "Fourth" FROM "table_72843" WHERE "Sixth" = 'Air Traffic'