CREATE TABLE table_30299 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "Original air date" CLOB, "Production code" CLOB, "U.S. viewers  ( million ) " CLOB)

What date did the episode with a production code of 3x6316 originally air?
SELECT "Original air date" FROM table_30299 WHERE "Production code" = '3X6316'
SELECT "Original air date" FROM "table_30299" WHERE "Production code" = '3X6316'