CREATE TABLE table_18424435_5 (us_air_date VARCHAR2, canadian_viewers__million_ VARCHAR2)

Which air dates have 1.229 canadian viewers (millions)?
SELECT us_air_date FROM table_18424435_5 WHERE canadian_viewers__million_ = "1.229"
SELECT "us_air_date" FROM "table_18424435_5" WHERE "1.229" = "canadian_viewers__million_"