CREATE TABLE table_24699 ("No." FLOAT, "#" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "Original air date" CLOB, "Production code" CLOB, "U.S. viewers  ( million ) " CLOB)

when was the premiere of the episode where the amount of North American spectators was 1.76 millions?
SELECT "Original air date" FROM table_24699 WHERE "U.S. viewers (million)" = '1.76'
SELECT "Original air date" FROM "table_24699" WHERE "U.S. viewers (million)" = '1.76'