CREATE TABLE table_27767 ("Series #" FLOAT, "Season #" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" FLOAT, "U.S. viewers  ( millions ) " TEXT)

What was the original air date of the episode that had 5.30 million U.S. viewers?
SELECT "Original air date" FROM table_27767 WHERE "U.S. viewers (millions)" = '5.30'
SELECT "Original air date" FROM "table_27767" WHERE "U.S. viewers (millions)" = '5.30'