CREATE TABLE table_28116528_1 (original_air_date VARCHAR, production_code VARCHAR)

What date did the episode with a production code of 3x6316 originally air?
SELECT original_air_date FROM table_28116528_1 WHERE production_code = "3X6316"
SELECT "original_air_date" FROM "table_28116528_1" WHERE "3X6316" = "production_code"