CREATE TABLE table_31123 ("Series #" FLOAT, "Season #" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" TEXT)

What is the original air date for the season# 2?
SELECT "Original air date" FROM table_31123 WHERE "Season #" = '2'
SELECT "Original air date" FROM "table_31123" WHERE "Season #" = '2'