CREATE TABLE table_26038 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Prod. code" TEXT, "U.S. Viewers  ( in millions ) " TEXT)

When did the episode with production code 213 air for the first time?
SELECT "Original air date" FROM table_26038 WHERE "Prod. code" = '213'
SELECT "Original air date" FROM "table_26038" WHERE "Prod. code" = '213'