CREATE TABLE table_24598 ("Season no." FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" TEXT, "U.S. Viewers  ( millions ) " TEXT)

What was the original air date for season number 2?
SELECT "Original air date" FROM table_24598 WHERE "Season no." = '2'
SELECT "Original air date" FROM "table_24598" WHERE "Season no." = '2'