CREATE TABLE table_22207 ("Series #" FLOAT, "Season #" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "U.S. viewers  ( millions ) " TEXT)

What is the original air date of season 9?
SELECT "Original air date" FROM table_22207 WHERE "Season #" = '9'
SELECT "Original air date" FROM "table_22207" WHERE "Season #" = '9'