CREATE TABLE table_1494 ("Series #" FLOAT, "Season #" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "Original air date" CLOB, "U.S. viewers  ( millions ) " CLOB)

Name the number air date for 14.20 us viewers
SELECT COUNT("Original air date") FROM table_1494 WHERE "U.S. viewers (millions)" = '14.20'
SELECT COUNT("Original air date") FROM "table_1494" WHERE "U.S. viewers (millions)" = '14.20'