CREATE TABLE table_29438 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "Original air date" CLOB, "Production code" CLOB, "U.S. viewers  ( millions ) " CLOB)

when was the episode with production code '2arg01' originally aired?
SELECT "Original air date" FROM table_29438 WHERE "Production code" = '2ARG01'
SELECT "Original air date" FROM "table_29438" WHERE "Production code" = '2ARG01'