CREATE TABLE table_22261877_1 (original_air_date VARCHAR2, production_code VARCHAR2)

What is the air date of the episode with the production code 6acx19?
SELECT original_air_date FROM table_22261877_1 WHERE production_code = "6ACX19"
SELECT "original_air_date" FROM "table_22261877_1" WHERE "6ACX19" = "production_code"