CREATE TABLE table_24188 ("No in Series" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "Original air date" CLOB, "Production code" FLOAT, "U.S. viewers  ( millions ) " CLOB)

How many original air dates were there for episodes with a production code of 4398016?
SELECT COUNT("Original air date") FROM table_24188 WHERE "Production code" = '4398016'
SELECT COUNT("Original air date") FROM "table_24188" WHERE "Production code" = '4398016'