CREATE TABLE table_30757 ("No in. series" FLOAT, "No in. season" FLOAT, "Title" CLOB, "Original air date" CLOB, "Production Code" FLOAT, "U.S. viewers  ( millions ) " CLOB)

What was the airdate of the episode of production code 214?
SELECT "Original air date" FROM table_30757 WHERE "Production Code" = '214'
SELECT "Original air date" FROM "table_30757" WHERE "Production Code" = '214'