SELECT MAX("Production code") FROM table_29802 WHERE "U.S. viewers (millions)" = '24.8'
What is the production code that had 24.8 million u.s. viewers?
CREATE TABLE table_29802 (
    "No. in series" real,
    "No. in season" real,
    "Title" text,
    "Directed by" text,
    "Written by" text,
    "Original air date" text,
    "Production code" real,
    "U.S. viewers (millions)" text
)