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

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'